666345111431 has 16 divisors (see below), whose sum is σ = 684337012128. Its totient is φ = 648437107200.

The previous prime is 666345111379. The next prime is 666345111449. The reversal of 666345111431 is 134111543666.

It is a de Polignac number, because none of the positive numbers 2^k-666345111431 is a prime.

It is a super-2 number, since 2×666345111431² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666345111491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76648721 + ... + 76657413.

It is an arithmetic number, because the mean of its divisors is an integer number (42771063258).

Almost surely, 2^666345111431 is an apocalyptic number.

666345111431 is a deficient number, since it is larger than the sum of its proper divisors (17991900697).

666345111431 is a wasteful number, since it uses less digits than its factorization.

666345111431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13282.

The product of its digits is 155520, while the sum is 41.

The spelling of 666345111431 in words is "six hundred sixty-six billion, three hundred forty-five million, one hundred eleven thousand, four hundred thirty-one".