51110065657 has 4 divisors (see below), whose sum is σ = 58411503616. Its totient is φ = 43808627700.

The previous prime is 51110065639. The next prime is 51110065661. The reversal of 51110065657 is 75656001115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51110065657 - 2¹⁹ = 51109541369 is a prime.

It is a super-2 number, since 2×51110065657² (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 (51110065627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3650718969 + ... + 3650718982.

It is an arithmetic number, because the mean of its divisors is an integer number (14602875904).

Almost surely, 2^51110065657 is an apocalyptic number.

It is an amenable number.

51110065657 is a deficient number, since it is larger than the sum of its proper divisors (7301437959).

51110065657 is an equidigital number, since it uses as much as digits as its factorization.

51110065657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7301437958.

The product of its (nonzero) digits is 31500, while the sum is 37.

The spelling of 51110065657 in words is "fifty-one billion, one hundred ten million, sixty-five thousand, six hundred fifty-seven".