3661640433 has 12 divisors (see below), whose sum is σ = 5769857808. Its totient is φ = 2219175960.

The previous prime is 3661640419. The next prime is 3661640453. The reversal of 3661640433 is 3340461663.

3661640433 is a `hidden beast` number, since 3 + 6 + 6 + 1 + 640 + 4 + 3 + 3 = 666.

It is not a de Polignac number, because 3661640433 - 2⁵ = 3661640401 is a prime.

It is a super-2 number, since 2×3661640433² = 26815221321160854978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3661640413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18493035 + ... + 18493232.

It is an arithmetic number, because the mean of its divisors is an integer number (480821484).

Almost surely, 2^3661640433 is an apocalyptic number.

3661640433 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

3661640433 is a deficient number, since it is larger than the sum of its proper divisors (2108217375).

3661640433 is a wasteful number, since it uses less digits than its factorization.

3661640433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36986284 (or 36986281 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

The square root of 3661640433 is about 60511.4900907257. The cubic root of 3661640433 is about 1541.3167510551.

The spelling of 3661640433 in words is "three billion, six hundred sixty-one million, six hundred forty thousand, four hundred thirty-three".