491495358638 has 16 divisors (see below), whose sum is σ = 743692992000. Its totient is φ = 243601053696.

The previous prime is 491495358623. The next prime is 491495358667. The reversal of 491495358638 is 836853594194.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 546263 + ... + 1131986.

It is an arithmetic number, because the mean of its divisors is an integer number (46480812000).

Almost surely, 2^491495358638 is an apocalyptic number.

491495358638 is a deficient number, since it is larger than the sum of its proper divisors (252197633362).

491495358638 is a wasteful number, since it uses less digits than its factorization.

491495358638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679531.

The product of its digits is 111974400, while the sum is 65.

The spelling of 491495358638 in words is "four hundred ninety-one billion, four hundred ninety-five million, three hundred fifty-eight thousand, six hundred thirty-eight".