204770989091 has 2 divisors, whose sum is σ = 204770989092. Its totient is φ = 204770989090.

The previous prime is 204770989067. The next prime is 204770989147. The reversal of 204770989091 is 190989077402.

It is an a-pointer prime, because the next prime (204770989147) can be obtained adding 204770989091 to its sum of digits (56).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204770989091 is a prime.

It is not a weakly prime, because it can be changed into another prime (204770989021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102385494545 + 102385494546.

It is an arithmetic number, because the mean of its divisors is an integer number (102385494546).

Almost surely, 2^204770989091 is an apocalyptic number.

204770989091 is a deficient number, since it is larger than the sum of its proper divisors (1).

204770989091 is an equidigital number, since it uses as much as digits as its factorization.

204770989091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The spelling of 204770989091 in words is "two hundred four billion, seven hundred seventy million, nine hundred eighty-nine thousand, ninety-one".