51520440105 has 48 divisors (see below), whose sum is σ = 93575139840. Its totient is φ = 26172795264.

The previous prime is 51520440079. The next prime is 51520440137. The reversal of 51520440105 is 50104402515.

51520440105 is a `hidden beast` number, since 51 + 5 + 204 + 401 + 0 + 5 = 666.

It is not a de Polignac number, because 51520440105 - 2¹⁶ = 51520374569 is a prime.

It is a super-2 number, since 2×51520440105² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 143227 + ... + 351503.

It is an arithmetic number, because the mean of its divisors is an integer number (1949482080).

Almost surely, 2^51520440105 is an apocalyptic number.

It is an amenable number.

51520440105 is a deficient number, since it is larger than the sum of its proper divisors (42054699735).

51520440105 is a wasteful number, since it uses less digits than its factorization.

51520440105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208550 (or 208547 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The spelling of 51520440105 in words is "fifty-one billion, five hundred twenty million, four hundred forty thousand, one hundred five".