3655220641637 has 2 divisors, whose sum is σ = 3655220641638. Its totient is φ = 3655220641636.

The previous prime is 3655220641601. The next prime is 3655220641661. The reversal of 3655220641637 is 7361460225563.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3056811643876 + 598408997761 = 1748374^2 + 773569^2 .

It is an emirp because it is prime and its reverse (7361460225563) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3655220641637 - 2¹⁴ = 3655220625253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3655220641337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1827610320818 + 1827610320819.

It is an arithmetic number, because the mean of its divisors is an integer number (1827610320819).

Almost surely, 2^{3655220641637} is an apocalyptic number.

It is an amenable number.

3655220641637 is a deficient number, since it is larger than the sum of its proper divisors (1).

3655220641637 is an equidigital number, since it uses as much as digits as its factorization.

3655220641637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 50.

The spelling of 3655220641637 in words is "three trillion, six hundred fifty-five billion, two hundred twenty million, six hundred forty-one thousand, six hundred thirty-seven".