51856801698 has 32 divisors (see below), whose sum is σ = 111740291712. Its totient is φ = 15948979200.

The previous prime is 51856801679. The next prime is 51856801723. The reversal of 51856801698 is 89610865815.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36418 + ... + 324098.

It is an arithmetic number, because the mean of its divisors is an integer number (3491884116).

Almost surely, 2^51856801698 is an apocalyptic number.

51856801698 is an abundant number, since it is smaller than the sum of its proper divisors (59883490014).

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

51856801698 is a wasteful number, since it uses less digits than its factorization.

51856801698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290010.

The product of its (nonzero) digits is 4147200, while the sum is 57.

The spelling of 51856801698 in words is "fifty-one billion, eight hundred fifty-six million, eight hundred one thousand, six hundred ninety-eight".