90663557 has 2 divisors, whose sum is σ = 90663558. Its totient is φ = 90663556.

The previous prime is 90663553. The next prime is 90663577. The reversal of 90663557 is 75536609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77457601 + 13205956 = 8801^2 + 3634^2 .

It is a cyclic number.

It is not a de Polignac number, because 90663557 - 2² = 90663553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90663553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45331778 + 45331779.

It is an arithmetic number, because the mean of its divisors is an integer number (45331779).

Almost surely, 2^90663557 is an apocalyptic number.

It is an amenable number.

90663557 is a deficient number, since it is larger than the sum of its proper divisors (1).

90663557 is an equidigital number, since it uses as much as digits as its factorization.

90663557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 41.

The square root of 90663557 is about 9521.7412798290. The cubic root of 90663557 is about 449.2391372991.

The spelling of 90663557 in words is "ninety million, six hundred sixty-three thousand, five hundred fifty-seven".