491765423646 has 48 divisors (see below), whose sum is σ = 1145631271680. Its totient is φ = 140317254000.

The previous prime is 491765423621. The next prime is 491765423701. The reversal of 491765423646 is 646324567194.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 892836 + ... + 1334423.

It is an arithmetic number, because the mean of its divisors is an integer number (23867318160).

Almost surely, 2^491765423646 is an apocalyptic number.

491765423646 is an abundant number, since it is smaller than the sum of its proper divisors (653865848034).

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

491765423646 is a wasteful number, since it uses less digits than its factorization.

491765423646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228029 (or 2228022 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 57.

The spelling of 491765423646 in words is "four hundred ninety-one billion, seven hundred sixty-five million, four hundred twenty-three thousand, six hundred forty-six".