681407888374 has 4 divisors (see below), whose sum is σ = 1022111832564. Its totient is φ = 340703944186.

The previous prime is 681407888351. The next prime is 681407888377. The reversal of 681407888374 is 473888704186.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681407888377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170351972092 + ... + 170351972095.

It is an arithmetic number, because the mean of its divisors is an integer number (255527958141).

Almost surely, 2^681407888374 is an apocalyptic number.

681407888374 is a deficient number, since it is larger than the sum of its proper divisors (340703944190).

681407888374 is a wasteful number, since it uses less digits than its factorization.

681407888374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340703944189.

The product of its (nonzero) digits is 57802752, while the sum is 64.

The spelling of 681407888374 in words is "six hundred eighty-one billion, four hundred seven million, eight hundred eighty-eight thousand, three hundred seventy-four".