6645562431 has 16 divisors (see below), whose sum is σ = 9327833856. Its totient is φ = 4200242816.

The previous prime is 6645562423. The next prime is 6645562439. The reversal of 6645562431 is 1342655466.

It is an interprime number because it is at equal distance from previous prime (6645562423) and next prime (6645562439).

It is a cyclic number.

It is not a de Polignac number, because 6645562431 - 2³ = 6645562423 is a prime.

It is a super-2 number, since 2×6645562431² = 88327000048637259522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645562439) 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, 418365 + ... + 433958.

It is an arithmetic number, because the mean of its divisors is an integer number (582989616).

Almost surely, 2^6645562431 is an apocalyptic number.

6645562431 is a deficient number, since it is larger than the sum of its proper divisors (2682271425).

6645562431 is a wasteful number, since it uses less digits than its factorization.

6645562431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852462.

The product of its digits is 518400, while the sum is 42.

The square root of 6645562431 is about 81520.3191296501. The cubic root of 6645562431 is about 1880.0839738219.

The spelling of 6645562431 in words is "six billion, six hundred forty-five million, five hundred sixty-two thousand, four hundred thirty-one".