51257225568 has 24 divisors (see below), whose sum is σ = 134550217368. Its totient is φ = 17085741824.

The previous prime is 51257225563. The next prime is 51257225633. The reversal of 51257225568 is 86552275215.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51257225563) 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, 266964621 + ... + 266964812.

It is an arithmetic number, because the mean of its divisors is an integer number (5606259057).

Almost surely, 2^51257225568 is an apocalyptic number.

It is an amenable number.

51257225568 is an abundant number, since it is smaller than the sum of its proper divisors (83292991800).

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

51257225568 is a wasteful number, since it uses less digits than its factorization.

51257225568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533929446 (or 533929438 counting only the distinct ones).

The product of its digits is 1680000, while the sum is 48.

The spelling of 51257225568 in words is "fifty-one billion, two hundred fifty-seven million, two hundred twenty-five thousand, five hundred sixty-eight".