646903968723 has 16 divisors (see below), whose sum is σ = 965371702560. Its totient is φ = 428121358848.

The previous prime is 646903968721. The next prime is 646903968743. The reversal of 646903968723 is 327869309646.

646903968723 is a `hidden beast` number, since 6 + 469 + 0 + 3 + 96 + 87 + 2 + 3 = 666.

It is not a de Polignac number, because 646903968723 - 2¹ = 646903968721 is a prime.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (646903968721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87439390 + ... + 87446787.

It is an arithmetic number, because the mean of its divisors is an integer number (60335731410).

Almost surely, 2^646903968723 is an apocalyptic number.

646903968723 is a deficient number, since it is larger than the sum of its proper divisors (318467733837).

646903968723 is a wasteful number, since it uses less digits than its factorization.

646903968723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174886323 (or 174886317 counting only the distinct ones).

The product of its (nonzero) digits is 70543872, while the sum is 63.

The spelling of 646903968723 in words is "six hundred forty-six billion, nine hundred three million, nine hundred sixty-eight thousand, seven hundred twenty-three".