680431655 has 8 divisors (see below), whose sum is σ = 852018912. Its totient is φ = 520678048.

The previous prime is 680431621. The next prime is 680431657. The reversal of 680431655 is 556134086.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-680431655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680431657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2958284 + ... + 2958513.

It is an arithmetic number, because the mean of its divisors is an integer number (106502364).

Almost surely, 2^680431655 is an apocalyptic number.

680431655 is a deficient number, since it is larger than the sum of its proper divisors (171587257).

680431655 is a wasteful number, since it uses less digits than its factorization.

680431655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5916825.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 680431655 is about 26085.0849145637. The cubic root of 680431655 is about 879.5519650261.

The spelling of 680431655 in words is "six hundred eighty million, four hundred thirty-one thousand, six hundred fifty-five".