642586455 has 24 divisors (see below), whose sum is σ = 1272933792. Its totient is φ = 293753664.

The previous prime is 642586447. The next prime is 642586471. The reversal of 642586455 is 554685246.

642586455 is a `hidden beast` number, since 64 + 2 + 586 + 4 + 5 + 5 = 666.

It is not a de Polignac number, because 642586455 - 2³ = 642586447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 642586455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1019664 + ... + 1020293.

It is an arithmetic number, because the mean of its divisors is an integer number (53038908).

Almost surely, 2^642586455 is an apocalyptic number.

642586455 is a deficient number, since it is larger than the sum of its proper divisors (630347337).

642586455 is a wasteful number, since it uses less digits than its factorization.

642586455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039975 (or 2039972 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 45.

The square root of 642586455 is about 25349.2890432848. The cubic root of 642586455 is about 862.9332215560.

The spelling of 642586455 in words is "six hundred forty-two million, five hundred eighty-six thousand, four hundred fifty-five".