491402136680 has 128 divisors (see below), whose sum is σ = 1440853505280. Its totient is φ = 146372382720.

The previous prime is 491402136661. The next prime is 491402136703. The reversal of 491402136680 is 86631204194.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3908726 + ... + 4032485.

It is an arithmetic number, because the mean of its divisors is an integer number (11256668010).

Almost surely, 2^491402136680 is an apocalyptic number.

491402136680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491402136680 is an abundant number, since it is smaller than the sum of its proper divisors (949451368600).

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

491402136680 is a wasteful number, since it uses less digits than its factorization.

491402136680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7941259 (or 7941255 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 491402136680 in words is "four hundred ninety-one billion, four hundred two million, one hundred thirty-six thousand, six hundred eighty".