51711991770 has 64 divisors (see below), whose sum is σ = 130493255040. Its totient is φ = 13096070400.

The previous prime is 51711991769. The next prime is 51711991781. The reversal of 51711991770 is 7719911715.

It is a happy number.

51711991770 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 434136 + ... + 540275.

It is an arithmetic number, because the mean of its divisors is an integer number (2038957110).

Almost surely, 2^51711991770 is an apocalyptic number.

51711991770 is an abundant number, since it is smaller than the sum of its proper divisors (78781263270).

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

51711991770 is a wasteful number, since it uses less digits than its factorization.

51711991770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974511.

The product of its (nonzero) digits is 138915, while the sum is 48.

The spelling of 51711991770 in words is "fifty-one billion, seven hundred eleven million, nine hundred ninety-one thousand, seven hundred seventy".