1605606515656 has 48 divisors (see below), whose sum is σ = 3563619702300. Its totient is φ = 673681050240.

The previous prime is 1605606515633. The next prime is 1605606515707. The reversal of 1605606515656 is 6565156065061.

It can be written as a sum of positive squares in 2 ways, for example, as 1520698383556 + 84908132100 = 1233166^2 + 291390^2 .

It is a super-2 number, since 2×1605606515656² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63782971 + ... + 63808138.

Almost surely, 2^{1605606515656} is an apocalyptic number.

It is an amenable number.

1605606515656 is an abundant number, since it is smaller than the sum of its proper divisors (1958013186644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1605606515656 is a wasteful number, since it uses less digits than its factorization.

1605606515656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127591150 (or 127591135 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 52.

The spelling of 1605606515656 in words is "one trillion, six hundred five billion, six hundred six million, five hundred fifteen thousand, six hundred fifty-six".