491367721258 has 16 divisors (see below), whose sum is σ = 756549084960. Its totient is φ = 239262527536.

The previous prime is 491367721231. The next prime is 491367721277. The reversal of 491367721258 is 852127763194.

It is a junction number, because it is equal to n+sod(n) for n = 491367721199 and 491367721208.

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, 19445941 + ... + 19471192.

It is an arithmetic number, because the mean of its divisors is an integer number (47284317810).

Almost surely, 2^491367721258 is an apocalyptic number.

491367721258 is a deficient number, since it is larger than the sum of its proper divisors (265181363702).

491367721258 is a wasteful number, since it uses less digits than its factorization.

491367721258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38917301.

The product of its digits is 5080320, while the sum is 55.

The spelling of 491367721258 in words is "four hundred ninety-one billion, three hundred sixty-seven million, seven hundred twenty-one thousand, two hundred fifty-eight".