204108387697 has 2 divisors, whose sum is σ = 204108387698. Its totient is φ = 204108387696.

The previous prime is 204108387649. The next prime is 204108387701. The reversal of 204108387697 is 796783801402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203113363761 + 995023936 = 450681^2 + 31544^2 .

It is a cyclic number.

It is not a de Polignac number, because 204108387697 - 2¹⁵ = 204108354929 is a prime.

It is not a weakly prime, because it can be changed into another prime (204108387617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102054193848 + 102054193849.

It is an arithmetic number, because the mean of its divisors is an integer number (102054193849).

Almost surely, 2^204108387697 is an apocalyptic number.

It is an amenable number.

204108387697 is a deficient number, since it is larger than the sum of its proper divisors (1).

204108387697 is an equidigital number, since it uses as much as digits as its factorization.

204108387697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 204108387697 in words is "two hundred four billion, one hundred eight million, three hundred eighty-seven thousand, six hundred ninety-seven".