646045155 has 72 divisors (see below), whose sum is σ = 1322382672. Its totient is φ = 290860416.

The previous prime is 646045139. The next prime is 646045181. The reversal of 646045155 is 551540646.

646045155 is a `hidden beast` number, since 6 + 460 + 45 + 155 = 666.

It is not a de Polignac number, because 646045155 - 2⁴ = 646045139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 145549 + ... + 149921.

It is an arithmetic number, because the mean of its divisors is an integer number (18366426).

Almost surely, 2^646045155 is an apocalyptic number.

646045155 is an abundant number, since it is smaller than the sum of its proper divisors (676337517).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646045155 is a wasteful number, since it uses less digits than its factorization.

646045155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4465 (or 4455 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 646045155 is about 25417.4183386118. The cubic root of 646045155 is about 864.4786884112.

It can be divided in two parts, 6460 and 45155, that added together give a palindrome (51615).

The spelling of 646045155 in words is "six hundred forty-six million, forty-five thousand, one hundred fifty-five".