646774651334 has 64 divisors (see below), whose sum is σ = 1158529651200. Its totient is φ = 265010496768.

The previous prime is 646774651333. The next prime is 646774651381. The reversal of 646774651334 is 433156477646.

It is a self number, because there is not a number n which added to its sum of digits gives 646774651334.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646774651333) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126493562 + ... + 126498674.

It is an arithmetic number, because the mean of its divisors is an integer number (18102025800).

Almost surely, 2^646774651334 is an apocalyptic number.

646774651334 is a deficient number, since it is larger than the sum of its proper divisors (511754999866).

646774651334 is a wasteful number, since it uses less digits than its factorization.

646774651334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9357.

The product of its digits is 30481920, while the sum is 56.

The spelling of 646774651334 in words is "six hundred forty-six billion, seven hundred seventy-four million, six hundred fifty-one thousand, three hundred thirty-four".