55857717999 has 6 divisors (see below), whose sum is σ = 80683370456. Its totient is φ = 37238478660.

The previous prime is 55857717983. The next prime is 55857718067. The reversal of 55857717999 is 99971775855.

55857717999 is a `hidden beast` number, since 558 + 57 + 7 + 17 + 9 + 9 + 9 = 666.

It is not a de Polignac number, because 55857717999 - 2⁴ = 55857717983 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 (55857717919) 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, 3103206547 + ... + 3103206564.

Almost surely, 2^55857717999 is an apocalyptic number.

55857717999 is a deficient number, since it is larger than the sum of its proper divisors (24825652457).

55857717999 is a wasteful number, since it uses less digits than its factorization.

55857717999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6206413117 (or 6206413114 counting only the distinct ones).

The product of its digits is 250047000, while the sum is 72.

The spelling of 55857717999 in words is "fifty-five billion, eight hundred fifty-seven million, seven hundred seventeen thousand, nine hundred ninety-nine".