51691690172035 has 8 divisors (see below), whose sum is σ = 62184716558496. Its totient is φ = 41250226569600.

The previous prime is 51691690171981. The next prime is 51691690172081. The reversal of 51691690172035 is 53027109619615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51691690172035 - 2³⁷ = 51554251218563 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12890693799 + ... + 12890697808.

It is an arithmetic number, because the mean of its divisors is an integer number (7773089569812).

Almost surely, 2^{51691690172035} is an apocalyptic number.

51691690172035 is a deficient number, since it is larger than the sum of its proper divisors (10493026386461).

51691690172035 is a wasteful number, since it uses less digits than its factorization.

51691690172035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25781392013.

The product of its (nonzero) digits is 3061800, while the sum is 55.

The spelling of 51691690172035 in words is "fifty-one trillion, six hundred ninety-one billion, six hundred ninety million, one hundred seventy-two thousand, thirty-five".