2515213661 has 4 divisors (see below), whose sum is σ = 2515322592. Its totient is φ = 2515104732.

The previous prime is 2515213627. The next prime is 2515213681. The reversal of 2515213661 is 1663125152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2515213661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2515213681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4631 + ... + 71076.

It is an arithmetic number, because the mean of its divisors is an integer number (628830648).

Almost surely, 2^2515213661 is an apocalyptic number.

It is an amenable number.

2515213661 is a deficient number, since it is larger than the sum of its proper divisors (108931).

2515213661 is an equidigital number, since it uses as much as digits as its factorization.

2515213661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108930.

The product of its digits is 10800, while the sum is 32.

The square root of 2515213661 is about 50151.9058561088. The cubic root of 2515213661 is about 1359.9563244697.

The spelling of 2515213661 in words is "two billion, five hundred fifteen million, two hundred thirteen thousand, six hundred sixty-one".