646117055 has 4 divisors (see below), whose sum is σ = 775340472. Its totient is φ = 516893640.

The previous prime is 646117049. The next prime is 646117061. The reversal of 646117055 is 550711646.

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

It is an interprime number because it is at equal distance from previous prime (646117049) and next prime (646117061).

It is not a de Polignac number, because 646117055 - 2²² = 641922751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64611701 + ... + 64611710.

It is an arithmetic number, because the mean of its divisors is an integer number (193835118).

Almost surely, 2^646117055 is an apocalyptic number.

646117055 is a deficient number, since it is larger than the sum of its proper divisors (129223417).

646117055 is a wasteful number, since it uses less digits than its factorization.

646117055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129223416.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 646117055 is about 25418.8326836619. The cubic root of 646117055 is about 864.5107572285.

The spelling of 646117055 in words is "six hundred forty-six million, one hundred seventeen thousand, fifty-five".