491437164639 has 8 divisors (see below), whose sum is σ = 655253439280. Its totient is φ = 327622833216.

The previous prime is 491437164607. The next prime is 491437164643. The reversal of 491437164639 is 936461734194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491437164639 - 2⁵ = 491437164607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491437164139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274107 + ... + 1028595.

It is an arithmetic number, because the mean of its divisors is an integer number (81906679910).

Almost surely, 2^491437164639 is an apocalyptic number.

491437164639 is a deficient number, since it is larger than the sum of its proper divisors (163816274641).

491437164639 is a wasteful number, since it uses less digits than its factorization.

491437164639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971609.

The product of its digits is 11757312, while the sum is 57.

The spelling of 491437164639 in words is "four hundred ninety-one billion, four hundred thirty-seven million, one hundred sixty-four thousand, six hundred thirty-nine".