55865808491 has 4 divisors (see below), whose sum is σ = 55893371352. Its totient is φ = 55838245632.

The previous prime is 55865808473. The next prime is 55865808499. The reversal of 55865808491 is 19480856855.

55865808491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55865808491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55865808491.

It is not an unprimeable number, because it can be changed into a prime (55865808499) 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, 13778390 + ... + 13782443.

It is an arithmetic number, because the mean of its divisors is an integer number (13973342838).

Almost surely, 2^55865808491 is an apocalyptic number.

55865808491 is a deficient number, since it is larger than the sum of its proper divisors (27562861).

55865808491 is a wasteful number, since it uses less digits than its factorization.

55865808491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27562860.

The product of its (nonzero) digits is 13824000, while the sum is 59.

The spelling of 55865808491 in words is "fifty-five billion, eight hundred sixty-five million, eight hundred eight thousand, four hundred ninety-one".