431661042136402 has 16 divisors (see below), whose sum is σ = 697315402149912. Its totient is φ = 199223374544640.

The previous prime is 431661042136393. The next prime is 431661042136403. The reversal of 431661042136402 is 204631240166134.

It can be written as a sum of positive squares in 4 ways, for example, as 344448024794721 + 87213017341681 = 18559311^2 + 9338791^2 .

It is not an unprimeable number, because it can be changed into a prime (431661042136403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198847573 + ... + 201006664.

Almost surely, 2^{431661042136402} is an apocalyptic number.

431661042136402 is a deficient number, since it is larger than the sum of its proper divisors (265654360013510).

431661042136402 is a wasteful number, since it uses less digits than its factorization.

431661042136402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399895773.

The product of its (nonzero) digits is 497664, while the sum is 43.

The spelling of 431661042136402 in words is "four hundred thirty-one trillion, six hundred sixty-one billion, forty-two million, one hundred thirty-six thousand, four hundred two".