491597364440 has 64 divisors (see below), whose sum is σ = 1361346557760. Its totient is φ = 155582461440.

The previous prime is 491597364439. The next prime is 491597364457. The reversal of 491597364440 is 44463795194.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67523471 + ... + 67530750.

It is an arithmetic number, because the mean of its divisors is an integer number (21271039965).

Almost surely, 2^491597364440 is an apocalyptic number.

491597364440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491597364440 is an abundant number, since it is smaller than the sum of its proper divisors (869749193320).

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

491597364440 is a wasteful number, since it uses less digits than its factorization.

491597364440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135054252 (or 135054248 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 56.

The spelling of 491597364440 in words is "four hundred ninety-one billion, five hundred ninety-seven million, three hundred sixty-four thousand, four hundred forty".