90742923617 has 2 divisors, whose sum is σ = 90742923618. Its totient is φ = 90742923616.

The previous prime is 90742923499. The next prime is 90742923701. The reversal of 90742923617 is 71632924709.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70371356176 + 20371567441 = 265276^2 + 142729^2 .

It is an emirp because it is prime and its reverse (71632924709) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90742923617 - 2⁸ = 90742923361 is a prime.

It is not a weakly prime, because it can be changed into another prime (90742922617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45371461808 + 45371461809.

It is an arithmetic number, because the mean of its divisors is an integer number (45371461809).

Almost surely, 2^90742923617 is an apocalyptic number.

It is an amenable number.

90742923617 is a deficient number, since it is larger than the sum of its proper divisors (1).

90742923617 is an equidigital number, since it uses as much as digits as its factorization.

90742923617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 50.

The spelling of 90742923617 in words is "ninety billion, seven hundred forty-two million, nine hundred twenty-three thousand, six hundred seventeen".