680687745591 has 48 divisors (see below), whose sum is σ = 1110253858560. Its totient is φ = 363289205760.

The previous prime is 680687745587. The next prime is 680687745593. The reversal of 680687745591 is 195547786086.

It is a happy number.

It is not a de Polignac number, because 680687745591 - 2² = 680687745587 is a prime.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680687745593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 366955 + ... + 1223123.

It is an arithmetic number, because the mean of its divisors is an integer number (23130288720).

Almost surely, 2^680687745591 is an apocalyptic number.

680687745591 is a deficient number, since it is larger than the sum of its proper divisors (429566112969).

680687745591 is a wasteful number, since it uses less digits than its factorization.

680687745591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856344 (or 856327 counting only the distinct ones).

The product of its (nonzero) digits is 101606400, while the sum is 66.

The spelling of 680687745591 in words is "six hundred eighty billion, six hundred eighty-seven million, seven hundred forty-five thousand, five hundred ninety-one".