51690720055 has 16 divisors (see below), whose sum is σ = 66813181344. Its totient is φ = 38164256640.

The previous prime is 51690719989. The next prime is 51690720071. The reversal of 51690720055 is 55002709615.

It is not a de Polignac number, because 51690720055 - 2³³ = 43100785463 is a prime.

It is a congruent 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, 275872 + ... + 423658.

It is an arithmetic number, because the mean of its divisors is an integer number (4175823834).

Almost surely, 2^51690720055 is an apocalyptic number.

51690720055 is a deficient number, since it is larger than the sum of its proper divisors (15122461289).

51690720055 is a wasteful number, since it uses less digits than its factorization.

51690720055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153186.

The product of its (nonzero) digits is 94500, while the sum is 40.

The spelling of 51690720055 in words is "fifty-one billion, six hundred ninety million, seven hundred twenty thousand, fifty-five".