90955555517 has 2 divisors, whose sum is σ = 90955555518. Its totient is φ = 90955555516.

The previous prime is 90955555501. The next prime is 90955555529. The reversal of 90955555517 is 71555555909.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55585606756 + 35369948761 = 235766^2 + 188069^2 .

It is a cyclic number.

It is not a de Polignac number, because 90955555517 - 2⁴ = 90955555501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90955555577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45477777758 + 45477777759.

It is an arithmetic number, because the mean of its divisors is an integer number (45477777759).

Almost surely, 2^90955555517 is an apocalyptic number.

It is an amenable number.

90955555517 is a deficient number, since it is larger than the sum of its proper divisors (1).

90955555517 is an equidigital number, since it uses as much as digits as its factorization.

90955555517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8859375, while the sum is 56.

The spelling of 90955555517 in words is "ninety billion, nine hundred fifty-five million, five hundred fifty-five thousand, five hundred seventeen".