491357921744 has 20 divisors (see below), whose sum is σ = 952049868480. Its totient is φ = 245667633120.

The previous prime is 491357921729. The next prime is 491357921753. The reversal of 491357921744 is 447129753194.

It is a self number, because there is not a number n which added to its sum of digits gives 491357921744.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344474 + ... + 1049465.

It is an arithmetic number, because the mean of its divisors is an integer number (47602493424).

Almost surely, 2^491357921744 is an apocalyptic number.

It is an amenable number.

491357921744 is a deficient number, since it is larger than the sum of its proper divisors (460691946736).

491357921744 is a wasteful number, since it uses less digits than its factorization.

491357921744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415978 (or 1415972 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 56.

The spelling of 491357921744 in words is "four hundred ninety-one billion, three hundred fifty-seven million, nine hundred twenty-one thousand, seven hundred forty-four".