491977345290 has 16 divisors (see below), whose sum is σ = 1180745628768. Its totient is φ = 131193958736.

The previous prime is 491977345289. The next prime is 491977345309. The reversal of 491977345290 is 92543779194.

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, 8199622392 + ... + 8199622451.

It is an arithmetic number, because the mean of its divisors is an integer number (73796601798).

Almost surely, 2^491977345290 is an apocalyptic number.

491977345290 is an abundant number, since it is smaller than the sum of its proper divisors (688768283478).

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

491977345290 is a wasteful number, since it uses less digits than its factorization.

491977345290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16399244853.

The product of its (nonzero) digits is 17146080, while the sum is 60.

The spelling of 491977345290 in words is "four hundred ninety-one billion, nine hundred seventy-seven million, three hundred forty-five thousand, two hundred ninety".