646126155 has 24 divisors (see below), whose sum is σ = 1143784512. Its totient is φ = 337267584.

The previous prime is 646126147. The next prime is 646126181. The reversal of 646126155 is 551621646.

646126155 is a `hidden beast` number, since 646 + 1 + 2 + 6 + 1 + 5 + 5 = 666.

It is not a de Polignac number, because 646126155 - 2³ = 646126147 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 150634 + ... + 154863.

It is an arithmetic number, because the mean of its divisors is an integer number (47657688).

Almost surely, 2^646126155 is an apocalyptic number.

646126155 is a deficient number, since it is larger than the sum of its proper divisors (497658357).

646126155 is a wasteful number, since it uses less digits than its factorization.

646126155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305555 (or 305552 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 646126155 is about 25419.0116841706. The cubic root of 646126155 is about 864.5148158382.

The spelling of 646126155 in words is "six hundred forty-six million, one hundred twenty-six thousand, one hundred fifty-five".