208290929057 has 2 divisors, whose sum is σ = 208290929058. Its totient is φ = 208290929056.

The previous prime is 208290929029. The next prime is 208290929059. The reversal of 208290929057 is 750929092802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179904070801 + 28386858256 = 424151^2 + 168484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208290929057 is a prime.

It is a super-2 number, since 2×208290929057² (a number of 23 digits) contains 22 as substring.

Together with 208290929059, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (208290929059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104145464528 + 104145464529.

It is an arithmetic number, because the mean of its divisors is an integer number (104145464529).

Almost surely, 2^208290929057 is an apocalyptic number.

It is an amenable number.

208290929057 is a deficient number, since it is larger than the sum of its proper divisors (1).

208290929057 is an equidigital number, since it uses as much as digits as its factorization.

208290929057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 208290929057 in words is "two hundred eight billion, two hundred ninety million, nine hundred twenty-nine thousand, fifty-seven".