646065126 has 64 divisors (see below), whose sum is σ = 1680860160. Its totient is φ = 180083520.

The previous prime is 646065109. The next prime is 646065137. The reversal of 646065126 is 621560646.

It is a happy number.

646065126 is a `hidden beast` number, since 646 + 0 + 6 + 5 + 1 + 2 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5346 + ... + 36341.

It is an arithmetic number, because the mean of its divisors is an integer number (26263440).

Almost surely, 2^646065126 is an apocalyptic number.

646065126 is an abundant number, since it is smaller than the sum of its proper divisors (1034795034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646065126 is a wasteful number, since it uses less digits than its factorization.

646065126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41746 (or 41740 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 646065126 is about 25417.8111960885. The cubic root of 646065126 is about 864.4875961095.

The spelling of 646065126 in words is "six hundred forty-six million, sixty-five thousand, one hundred twenty-six".