51105640542565 has 32 divisors (see below), whose sum is σ = 72507254895360. Its totient is φ = 33834198182400.

The previous prime is 51105640542521. The next prime is 51105640542581. The reversal of 51105640542565 is 56524504650115.

It is not a de Polignac number, because 51105640542565 - 2¹³ = 51105640534373 is a prime.

It is a super-2 number, since 2×51105640542565² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26725450 + ... + 28573780.

It is an arithmetic number, because the mean of its divisors is an integer number (2265851715480).

Almost surely, 2^{51105640542565} is an apocalyptic number.

It is an amenable number.

51105640542565 is a deficient number, since it is larger than the sum of its proper divisors (21401614352795).

51105640542565 is a wasteful number, since it uses less digits than its factorization.

51105640542565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875613.

The product of its (nonzero) digits is 3600000, while the sum is 49.

The spelling of 51105640542565 in words is "fifty-one trillion, one hundred five billion, six hundred forty million, five hundred forty-two thousand, five hundred sixty-five".