1225521257656 has 16 divisors (see below), whose sum is σ = 2418791956200. Its totient is φ = 580510069344.

The previous prime is 1225521257629. The next prime is 1225521257687. The reversal of 1225521257656 is 6567521255221.

It is a happy number.

It is a super-2 number, since 2×1225521257656² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4031319775 + ... + 4031320078.

Almost surely, 2^{1225521257656} is an apocalyptic number.

It is an amenable number.

1225521257656 is a deficient number, since it is larger than the sum of its proper divisors (1193270698544).

1225521257656 is a wasteful number, since it uses less digits than its factorization.

1225521257656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8062639878 (or 8062639874 counting only the distinct ones).

The product of its digits is 2520000, while the sum is 49.

The spelling of 1225521257656 in words is "one trillion, two hundred twenty-five billion, five hundred twenty-one million, two hundred fifty-seven thousand, six hundred fifty-six".