3665645531 has 8 divisors (see below), whose sum is σ = 3684744000. Its totient is φ = 3646578880.

The previous prime is 3665645497. The next prime is 3665645551. The reversal of 3665645531 is 1355465663.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3665645531 - 2¹⁴ = 3665629147 is a prime.

It is a super-2 number, since 2×3665645531² = 26873914317880543922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3665645551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243401 + ... + 258021.

It is an arithmetic number, because the mean of its divisors is an integer number (460593000).

Almost surely, 2^3665645531 is an apocalyptic number.

3665645531 is a deficient number, since it is larger than the sum of its proper divisors (19098469).

3665645531 is a wasteful number, since it uses less digits than its factorization.

3665645531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15909.

The product of its digits is 972000, while the sum is 44.

The square root of 3665645531 is about 60544.5747445632. The cubic root of 3665645531 is about 1541.8785097712.

The spelling of 3665645531 in words is "three billion, six hundred sixty-five million, six hundred forty-five thousand, five hundred thirty-one".