431666511056665 has 4 divisors (see below), whose sum is σ = 517999813268004. Its totient is φ = 345333208845328.

The previous prime is 431666511056617. The next prime is 431666511056713. The reversal of 431666511056665 is 566650115666134.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (431666511056617) and next prime (431666511056713).

It can be written as a sum of positive squares in 2 ways, for example, as 330114777621721 + 101551733434944 = 18169061^2 + 10077288^2 .

It is a cyclic number.

It is not a de Polignac number, because 431666511056665 - 2¹⁵ = 431666511023897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43166651105662 + ... + 43166651105671.

It is an arithmetic number, because the mean of its divisors is an integer number (129499953317001).

Almost surely, 2^{431666511056665} is an apocalyptic number.

It is an amenable number.

431666511056665 is a deficient number, since it is larger than the sum of its proper divisors (86333302211339).

431666511056665 is an equidigital number, since it uses as much as digits as its factorization.

431666511056665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86333302211338.

The product of its (nonzero) digits is 69984000, while the sum is 61.

The spelling of 431666511056665 in words is "four hundred thirty-one trillion, six hundred sixty-six billion, five hundred eleven million, fifty-six thousand, six hundred sixty-five".