90436561673 has 2 divisors, whose sum is σ = 90436561674. Its totient is φ = 90436561672.

The previous prime is 90436561613. The next prime is 90436561681. The reversal of 90436561673 is 37616563409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55694584009 + 34741977664 = 235997^2 + 186392^2 .

It is a cyclic number.

It is not a de Polignac number, because 90436561673 - 2⁸ = 90436561417 is a prime.

It is not a weakly prime, because it can be changed into another prime (90436561613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45218280836 + 45218280837.

It is an arithmetic number, because the mean of its divisors is an integer number (45218280837).

Almost surely, 2^90436561673 is an apocalyptic number.

It is an amenable number.

90436561673 is a deficient number, since it is larger than the sum of its proper divisors (1).

90436561673 is an equidigital number, since it uses as much as digits as its factorization.

90436561673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 50.

The spelling of 90436561673 in words is "ninety billion, four hundred thirty-six million, five hundred sixty-one thousand, six hundred seventy-three".