686630050921 has 16 divisors (see below), whose sum is σ = 693233795520. Its totient is φ = 680052098880.

The previous prime is 686630050867. The next prime is 686630050969. The reversal of 686630050921 is 129050036686.

It is a cyclic number.

It is not a de Polignac number, because 686630050921 - 2⁷ = 686630050793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686630050021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131108715 + ... + 131113951.

It is an arithmetic number, because the mean of its divisors is an integer number (43327112220).

Almost surely, 2^686630050921 is an apocalyptic number.

It is an amenable number.

686630050921 is a deficient number, since it is larger than the sum of its proper divisors (6603744599).

686630050921 is a wasteful number, since it uses less digits than its factorization.

686630050921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7464.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 686630050921 in words is "six hundred eighty-six billion, six hundred thirty million, fifty thousand, nine hundred twenty-one".