646466155 has 8 divisors (see below), whose sum is σ = 783440784. Its totient is φ = 512052000.

The previous prime is 646466141. The next prime is 646466207. The reversal of 646466155 is 551664646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-646466155 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639561 + ... + 640570.

It is an arithmetic number, because the mean of its divisors is an integer number (97930098).

Almost surely, 2^646466155 is an apocalyptic number.

646466155 is a deficient number, since it is larger than the sum of its proper divisors (136974629).

646466155 is a wasteful number, since it uses less digits than its factorization.

646466155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280237.

The product of its digits is 518400, while the sum is 43.

The square root of 646466155 is about 25425.6987121298. The cubic root of 646466155 is about 864.6664289005. Note that the first 3 decimals are identical.

The spelling of 646466155 in words is "six hundred forty-six million, four hundred sixty-six thousand, one hundred fifty-five".