55706517503991 has 24 divisors (see below), whose sum is σ = 85202030547504. Its totient is φ = 34951538845440.

The previous prime is 55706517503927. The next prime is 55706517503993. The reversal of 55706517503991 is 19930571560755.

55706517503991 is a `hidden beast` number, since 5 + 5 + 70 + 6 + 5 + 175 + 0 + 399 + 1 = 666.

It is not a de Polignac number, because 55706517503991 - 2⁶ = 55706517503927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55706517503993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4756336 + ... + 11577381.

It is an arithmetic number, because the mean of its divisors is an integer number (3550084606146).

Almost surely, 2^{55706517503991} is an apocalyptic number.

55706517503991 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

55706517503991 is a deficient number, since it is larger than the sum of its proper divisors (29495513043513).

55706517503991 is a wasteful number, since it uses less digits than its factorization.

55706517503991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16356031 (or 16356028 counting only the distinct ones).

The product of its (nonzero) digits is 44651250, while the sum is 63.

The spelling of 55706517503991 in words is "fifty-five trillion, seven hundred six billion, five hundred seventeen million, five hundred three thousand, nine hundred ninety-one".