431395997818 has 16 divisors (see below), whose sum is σ = 657814611456. Its totient is φ = 212125670640.

The previous prime is 431395997759. The next prime is 431395997863. The reversal of 431395997818 is 818799593134.

It is a super-2 number, since 2×431395997818² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420655 + ... + 1019677.

It is an arithmetic number, because the mean of its divisors is an integer number (41113413216).

Almost surely, 2^431395997818 is an apocalyptic number.

431395997818 is a deficient number, since it is larger than the sum of its proper divisors (226418613638).

431395997818 is a wasteful number, since it uses less digits than its factorization.

431395997818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604989.

The product of its digits is 58786560, while the sum is 67.

The spelling of 431395997818 in words is "four hundred thirty-one billion, three hundred ninety-five million, nine hundred ninety-seven thousand, eight hundred eighteen".