683540261621 has 16 divisors (see below), whose sum is σ = 813940310400. Its totient is φ = 561618767808.

The previous prime is 683540261539. The next prime is 683540261623. The reversal of 683540261621 is 126162045386.

It is not a de Polignac number, because 683540261621 - 2²² = 683536067317 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (683540261623) 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, 12083990 + ... + 12140423.

It is an arithmetic number, because the mean of its divisors is an integer number (50871269400).

Almost surely, 2^683540261621 is an apocalyptic number.

It is an amenable number.

683540261621 is a deficient number, since it is larger than the sum of its proper divisors (130400048779).

683540261621 is a wasteful number, since it uses less digits than its factorization.

683540261621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24224588.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 683540261621 in words is "six hundred eighty-three billion, five hundred forty million, two hundred sixty-one thousand, six hundred twenty-one".