491510033640 has 192 divisors, whose sum is σ = 1740411489600. Its totient is φ = 123359302656.

The previous prime is 491510033633. The next prime is 491510033671. The reversal of 491510033640 is 46330015194.

491510033640 is a `hidden beast` number, since 4 + 9 + 1 + 5 + 1 + 0 + 0 + 3 + 3 + 640 = 666.

It is a super-2 number, since 2×491510033640² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 491510033595 and 491510033604.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 475254 + ... + 1099493.

It is an arithmetic number, because the mean of its divisors is an integer number (9064643175).

Almost surely, 2^491510033640 is an apocalyptic number.

491510033640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491510033640 is an abundant number, since it is smaller than the sum of its proper divisors (1248901455960).

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

491510033640 is a wasteful number, since it uses less digits than its factorization.

491510033640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574801 (or 1574774 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 491510033640 in words is "four hundred ninety-one billion, five hundred ten million, thirty-three thousand, six hundred forty".