90983697557 has 2 divisors, whose sum is σ = 90983697558. Its totient is φ = 90983697556.

The previous prime is 90983697523. The next prime is 90983697569. The reversal of 90983697557 is 75579638909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90893808196 + 89889361 = 301486^2 + 9481^2 .

It is a cyclic number.

It is not a de Polignac number, because 90983697557 - 2¹⁶ = 90983632021 is a prime.

It is a super-2 number, since 2×90983697557² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90983697517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45491848778 + 45491848779.

It is an arithmetic number, because the mean of its divisors is an integer number (45491848779).

Almost surely, 2^90983697557 is an apocalyptic number.

It is an amenable number.

90983697557 is a deficient number, since it is larger than the sum of its proper divisors (1).

90983697557 is an equidigital number, since it uses as much as digits as its factorization.

90983697557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128595600, while the sum is 68.

The spelling of 90983697557 in words is "ninety billion, nine hundred eighty-three million, six hundred ninety-seven thousand, five hundred fifty-seven".