3656621544 has 16 divisors (see below), whose sum is σ = 9141553920. Its totient is φ = 1218873840.

The previous prime is 3656621539. The next prime is 3656621567. The reversal of 3656621544 is 4451266563.

It is a super-2 number, since 2×3656621544² = 26741762232089887872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3656621496 and 3656621505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76179592 + ... + 76179639.

It is an arithmetic number, because the mean of its divisors is an integer number (571347120).

Almost surely, 2^3656621544 is an apocalyptic number.

It is an amenable number.

3656621544 is an abundant number, since it is smaller than the sum of its proper divisors (5484932376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3656621544 is a wasteful number, since it uses less digits than its factorization.

3656621544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152359240 (or 152359236 counting only the distinct ones).

The product of its digits is 518400, while the sum is 42.

The square root of 3656621544 is about 60470.0053249543. The cubic root of 3656621544 is about 1540.6122184941.

The spelling of 3656621544 in words is "three billion, six hundred fifty-six million, six hundred twenty-one thousand, five hundred forty-four".