685554140431 has 4 divisors (see below), whose sum is σ = 725880854592. Its totient is φ = 645227426272.

The previous prime is 685554140377. The next prime is 685554140441. The reversal of 685554140431 is 134041455586.

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

It is a cyclic number.

It is not a de Polignac number, because 685554140431 - 2⁷ = 685554140303 is a prime.

It is a super-2 number, since 2×685554140431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685554140441) 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, 20163357055 + ... + 20163357088.

It is an arithmetic number, because the mean of its divisors is an integer number (181470213648).

Almost surely, 2^685554140431 is an apocalyptic number.

685554140431 is a deficient number, since it is larger than the sum of its proper divisors (40326714161).

685554140431 is a wasteful number, since it uses less digits than its factorization.

685554140431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40326714160.

The product of its (nonzero) digits is 1152000, while the sum is 46.

The spelling of 685554140431 in words is "six hundred eighty-five billion, five hundred fifty-four million, one hundred forty thousand, four hundred thirty-one".