90494746637 has 2 divisors, whose sum is σ = 90494746638. Its totient is φ = 90494746636.

The previous prime is 90494746591. The next prime is 90494746649. The reversal of 90494746637 is 73664749409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89436285481 + 1058461156 = 299059^2 + 32534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90494746637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90494745637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45247373318 + 45247373319.

It is an arithmetic number, because the mean of its divisors is an integer number (45247373319).

Almost surely, 2^90494746637 is an apocalyptic number.

It is an amenable number.

90494746637 is a deficient number, since it is larger than the sum of its proper divisors (1).

90494746637 is an equidigital number, since it uses as much as digits as its factorization.

90494746637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27433728, while the sum is 59.

The spelling of 90494746637 in words is "ninety billion, four hundred ninety-four million, seven hundred forty-six thousand, six hundred thirty-seven".