51257111566 has 8 divisors (see below), whose sum is σ = 80932281480. Its totient is φ = 24279684408.

The previous prime is 51257111561. The next prime is 51257111597. The reversal of 51257111566 is 66511175215.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51257111561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674435641 + ... + 674435716.

It is an arithmetic number, because the mean of its divisors is an integer number (10116535185).

Almost surely, 2^51257111566 is an apocalyptic number.

51257111566 is a deficient number, since it is larger than the sum of its proper divisors (29675169914).

51257111566 is a wasteful number, since it uses less digits than its factorization.

51257111566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348871378.

The product of its digits is 63000, while the sum is 40.

The spelling of 51257111566 in words is "fifty-one billion, two hundred fifty-seven million, one hundred eleven thousand, five hundred sixty-six".