51520071507 has 32 divisors (see below), whose sum is σ = 72442626048. Its totient is φ = 32504483616.

The previous prime is 51520071467. The next prime is 51520071523. The reversal of 51520071507 is 70517002515.

It is not a de Polignac number, because 51520071507 - 2⁶ = 51520071443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51520071587) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9712618 + ... + 9717920.

It is an arithmetic number, because the mean of its divisors is an integer number (2263832064).

Almost surely, 2^51520071507 is an apocalyptic number.

51520071507 is a deficient number, since it is larger than the sum of its proper divisors (20922554541).

51520071507 is a wasteful number, since it uses less digits than its factorization.

51520071507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6799.

The product of its (nonzero) digits is 12250, while the sum is 33.

The spelling of 51520071507 in words is "fifty-one billion, five hundred twenty million, seventy-one thousand, five hundred seven".