491257801888 has 48 divisors (see below), whose sum is σ = 1115111793600. Its totient is φ = 208675869696.

The previous prime is 491257801871. The next prime is 491257801907. The reversal of 491257801888 is 888108752194.

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, 9678738 + ... + 9729361.

It is an arithmetic number, because the mean of its divisors is an integer number (23231495700).

Almost surely, 2^491257801888 is an apocalyptic number.

It is an amenable number.

491257801888 is an abundant number, since it is smaller than the sum of its proper divisors (623853991712).

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

491257801888 is a wasteful number, since it uses less digits than its factorization.

491257801888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19408229 (or 19408221 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 61.

The spelling of 491257801888 in words is "four hundred ninety-one billion, two hundred fifty-seven million, eight hundred one thousand, eight hundred eighty-eight".