64855155491 has 16 divisors (see below), whose sum is σ = 74678499840. Its totient is φ = 55172059200.

The previous prime is 64855155479. The next prime is 64855155493. The reversal of 64855155491 is 19455155846.

64855155491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64855155491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64855155493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1166180 + ... + 1220526.

It is an arithmetic number, because the mean of its divisors is an integer number (4667406240).

Almost surely, 2^64855155491 is an apocalyptic number.

64855155491 is a deficient number, since it is larger than the sum of its proper divisors (9823344349).

64855155491 is a wasteful number, since it uses less digits than its factorization.

64855155491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55634.

The product of its digits is 4320000, while the sum is 53.

The spelling of 64855155491 in words is "sixty-four billion, eight hundred fifty-five million, one hundred fifty-five thousand, four hundred ninety-one".