3655645121 has 2 divisors, whose sum is σ = 3655645122. Its totient is φ = 3655645120.

The previous prime is 3655645079. The next prime is 3655645127. The reversal of 3655645121 is 1215465563.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3485603521 + 170041600 = 59039^2 + 13040^2 .

It is a cyclic number.

It is not a de Polignac number, because 3655645121 - 2⁶ = 3655645057 is a prime.

It is a super-2 number, since 2×3655645121² = 26727482501382209282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3655645127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1827822560 + 1827822561.

It is an arithmetic number, because the mean of its divisors is an integer number (1827822561).

Almost surely, 2^3655645121 is an apocalyptic number.

It is an amenable number.

3655645121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3655645121 is an equidigital number, since it uses as much as digits as its factorization.

3655645121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108000, while the sum is 38.

The square root of 3655645121 is about 60461.9311716058. The cubic root of 3655645121 is about 1540.4750770460.

The spelling of 3655645121 in words is "three billion, six hundred fifty-five million, six hundred forty-five thousand, one hundred twenty-one".