646634343015 has 24 divisors (see below), whose sum is σ = 1186764207408. Its totient is φ = 324585081600.

The previous prime is 646634342989. The next prime is 646634343023. The reversal of 646634343015 is 510343436646.

646634343015 is a `hidden beast` number, since 6 + 4 + 6 + 634 + 3 + 4 + 3 + 0 + 1 + 5 = 666.

It is not a de Polignac number, because 646634343015 - 2¹³ = 646634334823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 422636061 + ... + 422637590.

It is an arithmetic number, because the mean of its divisors is an integer number (49448508642).

Almost surely, 2^646634343015 is an apocalyptic number.

646634343015 is a deficient number, since it is larger than the sum of its proper divisors (540129864393).

646634343015 is a wasteful number, since it uses less digits than its factorization.

646634343015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845273679 (or 845273676 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 45.

The spelling of 646634343015 in words is "six hundred forty-six billion, six hundred thirty-four million, three hundred forty-three thousand, fifteen".