90798942457 has 2 divisors, whose sum is σ = 90798942458. Its totient is φ = 90798942456.

The previous prime is 90798942449. The next prime is 90798942463. The reversal of 90798942457 is 75424989709.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67300811776 + 23498130681 = 259424^2 + 153291^2 .

It is a cyclic number.

It is not a de Polignac number, because 90798942457 - 2³ = 90798942449 is a prime.

It is not a weakly prime, because it can be changed into another prime (90798942497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45399471228 + 45399471229.

It is an arithmetic number, because the mean of its divisors is an integer number (45399471229).

Almost surely, 2^90798942457 is an apocalyptic number.

It is an amenable number.

90798942457 is a deficient number, since it is larger than the sum of its proper divisors (1).

90798942457 is an equidigital number, since it uses as much as digits as its factorization.

90798942457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45722880, while the sum is 64.

The spelling of 90798942457 in words is "ninety billion, seven hundred ninety-eight million, nine hundred forty-two thousand, four hundred fifty-seven".