3660617661 has 4 divisors (see below), whose sum is σ = 4880823552. Its totient is φ = 2440411772.

The previous prime is 3660617627. The next prime is 3660617699. The reversal of 3660617661 is 1667160663.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3660617661 - 2²² = 3656423357 is a prime.

It is a super-2 number, since 2×3660617661² = 26800243320050221842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3660617461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610102941 + ... + 610102946.

It is an arithmetic number, because the mean of its divisors is an integer number (1220205888).

Almost surely, 2^3660617661 is an apocalyptic number.

It is an amenable number.

3660617661 is a deficient number, since it is larger than the sum of its proper divisors (1220205891).

3660617661 is a wasteful number, since it uses less digits than its factorization.

3660617661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220205890.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 3660617661 is about 60503.0384443624. The cubic root of 3660617661 is about 1541.1732304626.

The spelling of 3660617661 in words is "three billion, six hundred sixty million, six hundred seventeen thousand, six hundred sixty-one".