646309155 has 16 divisors (see below), whose sum is σ = 1062044064. Its totient is φ = 335381760.

The previous prime is 646309133. The next prime is 646309159. The reversal of 646309155 is 551903646.

It is not a de Polignac number, because 646309155 - 2⁵ = 646309123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646309159) 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, 581706 + ... + 582815.

It is an arithmetic number, because the mean of its divisors is an integer number (66377754).

Almost surely, 2^646309155 is an apocalyptic number.

646309155 is a deficient number, since it is larger than the sum of its proper divisors (415734909).

646309155 is a wasteful number, since it uses less digits than its factorization.

646309155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164566.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 646309155 is about 25422.6110972103. The cubic root of 646309155 is about 864.5964259471.

The spelling of 646309155 in words is "six hundred forty-six million, three hundred nine thousand, one hundred fifty-five".