51545515506 has 16 divisors (see below), whose sum is σ = 103094639904. Its totient is φ = 17181237024.

The previous prime is 51545515451. The next prime is 51545515531. The reversal of 51545515506 is 60551554515.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57390 + ... + 326166.

It is an arithmetic number, because the mean of its divisors is an integer number (6443414994).

Almost surely, 2^51545515506 is an apocalyptic number.

51545515506 is an abundant number, since it is smaller than the sum of its proper divisors (51549124398).

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

51545515506 is a wasteful number, since it uses less digits than its factorization.

51545515506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300745.

The product of its (nonzero) digits is 375000, while the sum is 42.

The spelling of 51545515506 in words is "fifty-one billion, five hundred forty-five million, five hundred fifteen thousand, five hundred six".