2815667641 has 4 divisors (see below), whose sum is σ = 2816491252. Its totient is φ = 2814844032.

The previous prime is 2815667633. The next prime is 2815667663. The reversal of 2815667641 is 1467665182.

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 1201315600 + 1614352041 = 34660^2 + 40179^2 .

It is a cyclic number.

It is not a de Polignac number, because 2815667641 - 2³ = 2815667633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2815667591 and 2815667600.

It is not an unprimeable number, because it can be changed into a prime (2815667671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406656 + ... + 413521.

It is an arithmetic number, because the mean of its divisors is an integer number (704122813).

Almost surely, 2^2815667641 is an apocalyptic number.

It is an amenable number.

2815667641 is a deficient number, since it is larger than the sum of its proper divisors (823611).

2815667641 is an equidigital number, since it uses as much as digits as its factorization.

2815667641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823610.

The product of its digits is 483840, while the sum is 46.

The square root of 2815667641 is about 53062.8649904997. The cubic root of 2815667641 is about 1412.0837759293.

The spelling of 2815667641 in words is "two billion, eight hundred fifteen million, six hundred sixty-seven thousand, six hundred forty-one".