51257225561 has 8 divisors (see below), whose sum is σ = 51666120000. Its totient is φ = 50848598320.

The previous prime is 51257225531. The next prime is 51257225563. The reversal of 51257225561 is 16552275215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51257225561 is a prime.

It is a super-2 number, since 2×51257225561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51257225563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327635 + ... + 458103.

It is an arithmetic number, because the mean of its divisors is an integer number (6458265000).

Almost surely, 2^51257225561 is an apocalyptic number.

It is an amenable number.

51257225561 is a deficient number, since it is larger than the sum of its proper divisors (408894439).

51257225561 is a wasteful number, since it uses less digits than its factorization.

51257225561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133599.

The product of its digits is 210000, while the sum is 41.

The spelling of 51257225561 in words is "fifty-one billion, two hundred fifty-seven million, two hundred twenty-five thousand, five hundred sixty-one".