90806622356993 has 2 divisors, whose sum is σ = 90806622356994. Its totient is φ = 90806622356992.

The previous prime is 90806622356987. The next prime is 90806622357047. The reversal of 90806622356993 is 39965322660809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79267094884849 + 11539527472144 = 8903207^2 + 3396988^2 .

It is a cyclic number.

It is not a de Polignac number, because 90806622356993 - 2¹⁶ = 90806622291457 is a prime.

It is not a weakly prime, because it can be changed into another prime (90806622356903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45403311178496 + 45403311178497.

It is an arithmetic number, because the mean of its divisors is an integer number (45403311178497).

Almost surely, 2^{90806622356993} is an apocalyptic number.

It is an amenable number.

90806622356993 is a deficient number, since it is larger than the sum of its proper divisors (1).

90806622356993 is an equidigital number, since it uses as much as digits as its factorization.

90806622356993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226748160, while the sum is 68.

The spelling of 90806622356993 in words is "ninety trillion, eight hundred six billion, six hundred twenty-two million, three hundred fifty-six thousand, nine hundred ninety-three".