51922406691 has 6 divisors (see below), whose sum is σ = 74999031900. Its totient is φ = 34614937788.

The previous prime is 51922406639. The next prime is 51922406699. The reversal of 51922406691 is 19660422915.

51922406691 is a `hidden beast` number, since 519 + 2 + 2 + 40 + 6 + 6 + 91 = 666.

It is not a de Polignac number, because 51922406691 - 2⁷ = 51922406563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51922406699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2884578141 + ... + 2884578158.

It is an arithmetic number, because the mean of its divisors is an integer number (12499838650).

Almost surely, 2^51922406691 is an apocalyptic number.

51922406691 is a deficient number, since it is larger than the sum of its proper divisors (23076625209).

51922406691 is a wasteful number, since it uses less digits than its factorization.

51922406691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5769156305 (or 5769156302 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 51922406691 in words is "fifty-one billion, nine hundred twenty-two million, four hundred six thousand, six hundred ninety-one".