51521311334505 has 32 divisors (see below), whose sum is σ = 84358660700160. Its totient is φ = 26836625350080.

The previous prime is 51521311334503. The next prime is 51521311334509. The reversal of 51521311334505 is 50543311312515.

It is not a de Polignac number, because 51521311334505 - 2¹ = 51521311334503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51521311334503) 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, 3733950 + ... + 10815960.

It is an arithmetic number, because the mean of its divisors is an integer number (2636208146880).

Almost surely, 2^{51521311334505} is an apocalyptic number.

It is an amenable number.

51521311334505 is a deficient number, since it is larger than the sum of its proper divisors (32837349365655).

51521311334505 is a wasteful number, since it uses less digits than its factorization.

51521311334505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7093341.

The product of its (nonzero) digits is 135000, while the sum is 39.

The spelling of 51521311334505 in words is "fifty-one trillion, five hundred twenty-one billion, three hundred eleven million, three hundred thirty-four thousand, five hundred five".