3656646731 has 2 divisors, whose sum is σ = 3656646732. Its totient is φ = 3656646730.

The previous prime is 3656646727. The next prime is 3656646751. The reversal of 3656646731 is 1376466563.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3656646731 - 2² = 3656646727 is a prime.

It is a super-2 number, since 2×3656646731² = 26742130630665972722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3656646751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1828323365 + 1828323366.

It is an arithmetic number, because the mean of its divisors is an integer number (1828323366).

Almost surely, 2^3656646731 is an apocalyptic number.

3656646731 is a deficient number, since it is larger than the sum of its proper divisors (1).

3656646731 is an equidigital number, since it uses as much as digits as its factorization.

3656646731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 47.

The square root of 3656646731 is about 60470.2135848717. The cubic root of 3656646731 is about 1540.6157557584.

The spelling of 3656646731 in words is "three billion, six hundred fifty-six million, six hundred forty-six thousand, seven hundred thirty-one".