51506511534220 has 24 divisors (see below), whose sum is σ = 108168809377104. Its totient is φ = 20601626488896.

The previous prime is 51506511534187. The next prime is 51506511534229. The reversal of 51506511534220 is 2243511560515.

It is not an unprimeable number, because it can be changed into a prime (51506511534229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60700927 + ... + 61543606.

It is an arithmetic number, because the mean of its divisors is an integer number (4507033724046).

Almost surely, 2^{51506511534220} is an apocalyptic number.

It is an amenable number.

51506511534220 is an abundant number, since it is smaller than the sum of its proper divisors (56662297842884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51506511534220 is a wasteful number, since it uses less digits than its factorization.

51506511534220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122265609 (or 122265607 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 51506511534220 in words is "fifty-one trillion, five hundred six billion, five hundred eleven million, five hundred thirty-four thousand, two hundred twenty".