3656161215 has 72 divisors (see below), whose sum is σ = 7543652688. Its totient is φ = 1632476160.

The previous prime is 3656161177. The next prime is 3656161291. The reversal of 3656161215 is 5121616563.

3656161215 is a `hidden beast` number, since 36 + 5 + 6 + 1 + 612 + 1 + 5 = 666.

It is not a de Polignac number, because 3656161215 - 2¹¹ = 3656159167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3656161215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 75535 + ... + 114095.

It is an arithmetic number, because the mean of its divisors is an integer number (104772954).

Almost surely, 2^3656161215 is an apocalyptic number.

3656161215 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3656161215 is an abundant number, since it is smaller than the sum of its proper divisors (3887491473).

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

3656161215 is a wasteful number, since it uses less digits than its factorization.

3656161215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38629 (or 38619 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 3656161215 is about 60466.1989461881. The cubic root of 3656161215 is about 1540.5475669904.

Adding to 3656161215 its reverse (5121616563), we get a palindrome (8777777778).

The spelling of 3656161215 in words is "three billion, six hundred fifty-six million, one hundred sixty-one thousand, two hundred fifteen".