680621028665 has 8 divisors (see below), whose sum is σ = 817179915840. Its totient is φ = 544207035312.

The previous prime is 680621028629. The next prime is 680621028677. The reversal of 680621028665 is 566820126086.

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

It is a cyclic number.

It is not a de Polignac number, because 680621028665 - 2¹⁶ = 680620963129 is a prime.

It is a super-2 number, since 2×680621028665² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36213119 + ... + 36231908.

It is an arithmetic number, because the mean of its divisors is an integer number (102147489480).

Almost surely, 2^680621028665 is an apocalyptic number.

It is an amenable number.

680621028665 is a deficient number, since it is larger than the sum of its proper divisors (136558887175).

680621028665 is a wasteful number, since it uses less digits than its factorization.

680621028665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72446911.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 680621028665 in words is "six hundred eighty billion, six hundred twenty-one million, twenty-eight thousand, six hundred sixty-five".