2166647431 has 12 divisors (see below), whose sum is σ = 2379190320. Its totient is φ = 1971802560.

The previous prime is 2166647363. The next prime is 2166647459. The reversal of 2166647431 is 1347466612.

It is not a de Polignac number, because 2166647431 - 2⁷ = 2166647303 is a prime.

It is a super-2 number, since 2×2166647431² = 9388722180517799522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166647831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78286 + ... + 102283.

It is an arithmetic number, because the mean of its divisors is an integer number (198265860).

Almost surely, 2^2166647431 is an apocalyptic number.

2166647431 is a deficient number, since it is larger than the sum of its proper divisors (212542889).

2166647431 is a wasteful number, since it uses less digits than its factorization.

2166647431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180666 (or 180653 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 2166647431 is about 46547.2601878994. The cubic root of 2166647431 is about 1293.9855167522.

The spelling of 2166647431 in words is "two billion, one hundred sixty-six million, six hundred forty-seven thousand, four hundred thirty-one".