491680556025 has 12 divisors (see below), whose sum is σ = 812911852752. Its totient is φ = 262229629840.

The previous prime is 491680555969. The next prime is 491680556041. The reversal of 491680556025 is 520655086194.

It is a happy number.

It is not a de Polignac number, because 491680556025 - 2¹⁶ = 491680490489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3277870299 + ... + 3277870448.

It is an arithmetic number, because the mean of its divisors is an integer number (67742654396).

Almost surely, 2^491680556025 is an apocalyptic number.

It is an amenable number.

491680556025 is a deficient number, since it is larger than the sum of its proper divisors (321231296727).

491680556025 is a wasteful number, since it uses less digits than its factorization.

491680556025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6555740760 (or 6555740755 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 51.

The spelling of 491680556025 in words is "four hundred ninety-one billion, six hundred eighty million, five hundred fifty-six thousand, twenty-five".