51704564806878 has 32 divisors (see below), whose sum is σ = 103611340512000. Its totient is φ = 17201177881536.

The previous prime is 51704564806877. The next prime is 51704564806913. The reversal of 51704564806878 is 87860846540715.

It is a super-2 number, since 2×51704564806878² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51704564806877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5261898 + ... + 11449746.

It is an arithmetic number, because the mean of its divisors is an integer number (3237854391000).

Almost surely, 2^{51704564806878} is an apocalyptic number.

51704564806878 is an abundant number, since it is smaller than the sum of its proper divisors (51906775705122).

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

51704564806878 is a wasteful number, since it uses less digits than its factorization.

51704564806878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6190576.

The product of its (nonzero) digits is 361267200, while the sum is 69.

The spelling of 51704564806878 in words is "fifty-one trillion, seven hundred four billion, five hundred sixty-four million, eight hundred six thousand, eight hundred seventy-eight".