10251555621656 has 8 divisors (see below), whose sum is σ = 19221666790620. Its totient is φ = 5125777810824.

The previous prime is 10251555621611. The next prime is 10251555621661. The reversal of 10251555621656 is 65612655515201.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640722226346 + ... + 640722226361.

Almost surely, 2^{10251555621656} is an apocalyptic number.

It is an amenable number.

10251555621656 is a deficient number, since it is larger than the sum of its proper divisors (8970111168964).

10251555621656 is a wasteful number, since it uses less digits than its factorization.

10251555621656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281444452713 (or 1281444452709 counting only the distinct ones).

The product of its (nonzero) digits is 2700000, while the sum is 50.

The spelling of 10251555621656 in words is "ten trillion, two hundred fifty-one billion, five hundred fifty-five million, six hundred twenty-one thousand, six hundred fifty-six".