3656226011661 has 24 divisors (see below), whose sum is σ = 5597894535480. Its totient is φ = 2291633074176.

The previous prime is 3656226011611. The next prime is 3656226011687. The reversal of 3656226011661 is 1661106226563.

3656226011661 is a `hidden beast` number, since 3 + 6 + 5 + 6 + 22 + 601 + 16 + 6 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 35505864900 + 3620720146761 = 188430^2 + 1902819^2 .

It is not a de Polignac number, because 3656226011661 - 2¹⁰ = 3656226010637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656226011611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12719490 + ... + 13003763.

It is an arithmetic number, because the mean of its divisors is an integer number (233245605645).

Almost surely, 2^{3656226011661} is an apocalyptic number.

It is an amenable number.

3656226011661 is a deficient number, since it is larger than the sum of its proper divisors (1941668523819).

3656226011661 is a wasteful number, since it uses less digits than its factorization.

3656226011661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25724205 (or 25724202 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 3656226011661 in words is "three trillion, six hundred fifty-six billion, two hundred twenty-six million, eleven thousand, six hundred sixty-one".