55511050059991 has 4 divisors (see below), whose sum is σ = 55514787940984. Its totient is φ = 55507312179000.

The previous prime is 55511050059989. The next prime is 55511050060001. The reversal of 55511050059991 is 19995005011555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55511050059991 - 2¹ = 55511050059989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55511050051991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1868918220 + ... + 1868947921.

It is an arithmetic number, because the mean of its divisors is an integer number (13878696985246).

Almost surely, 2^{55511050059991} is an apocalyptic number.

55511050059991 is a deficient number, since it is larger than the sum of its proper divisors (3737880993).

55511050059991 is a wasteful number, since it uses less digits than its factorization.

55511050059991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3737880992.

The product of its (nonzero) digits is 2278125, while the sum is 55.

The spelling of 55511050059991 in words is "fifty-five trillion, five hundred eleven billion, fifty million, fifty-nine thousand, nine hundred ninety-one".