2615424661 has 4 divisors (see below), whose sum is σ = 2686111852. Its totient is φ = 2544737472.

The previous prime is 2615424649. The next prime is 2615424697. The reversal of 2615424661 is 1664245162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1786330225 + 829094436 = 42265^2 + 28794^2 .

It is a cyclic number.

It is not a de Polignac number, because 2615424661 - 2²⁵ = 2581870229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 70687153 = 2615424661 / (2 + 6 + 1 + 5 + 4 + 2 + 4 + 6 + 6 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2615424661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2615424601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35343540 + ... + 35343613.

It is an arithmetic number, because the mean of its divisors is an integer number (671527963).

Almost surely, 2^2615424661 is an apocalyptic number.

It is an amenable number.

2615424661 is a deficient number, since it is larger than the sum of its proper divisors (70687191).

2615424661 is an equidigital number, since it uses as much as digits as its factorization.

2615424661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70687190.

The product of its digits is 69120, while the sum is 37.

The square root of 2615424661 is about 51141.2227170998. Note that the first 3 decimals coincide. The cubic root of 2615424661 is about 1377.7827344671.

The spelling of 2615424661 in words is "two billion, six hundred fifteen million, four hundred twenty-four thousand, six hundred sixty-one".