685582830731 has 4 divisors (see below), whose sum is σ = 685586082000. Its totient is φ = 685579579464.

The previous prime is 685582830689. The next prime is 685582830781. The reversal of 685582830731 is 137038285586.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685582830731 is a prime.

It is a super-2 number, since 2×685582830731² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685582830781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1285631 + ... + 1738968.

It is an arithmetic number, because the mean of its divisors is an integer number (171396520500).

Almost surely, 2^685582830731 is an apocalyptic number.

685582830731 is a deficient number, since it is larger than the sum of its proper divisors (3251269).

685582830731 is a wasteful number, since it uses less digits than its factorization.

685582830731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251268.

The product of its (nonzero) digits is 9676800, while the sum is 56.

The spelling of 685582830731 in words is "six hundred eighty-five billion, five hundred eighty-two million, eight hundred thirty thousand, seven hundred thirty-one".