3665866557 has 8 divisors (see below), whose sum is σ = 4926309376. Its totient is φ = 2424667392.

The previous prime is 3665866541. The next prime is 3665866601. The reversal of 3665866557 is 7556685663.

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

It is not a de Polignac number, because 3665866557 - 2⁴ = 3665866541 is a prime.

It is a super-2 number, since 2×3665866557² = 26877155227462068498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3665866497 and 3665866506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665866507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4810468 + ... + 4811229.

It is an arithmetic number, because the mean of its divisors is an integer number (615788672).

Almost surely, 2^3665866557 is an apocalyptic number.

It is an amenable number.

3665866557 is a deficient number, since it is larger than the sum of its proper divisors (1260442819).

3665866557 is a wasteful number, since it uses less digits than its factorization.

3665866557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9621827.

The product of its digits is 27216000, while the sum is 57.

The square root of 3665866557 is about 60546.4000333628. The cubic root of 3665866557 is about 1541.9094991642.

The spelling of 3665866557 in words is "three billion, six hundred sixty-five million, eight hundred sixty-six thousand, five hundred fifty-seven".