90658661 has 2 divisors, whose sum is σ = 90658662. Its totient is φ = 90658660.

The previous prime is 90658651. The next prime is 90658699. The reversal of 90658661 is 16685609.

90658661 is nontrivially palindromic in base 16.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68989636 + 21669025 = 8306^2 + 4655^2 .

It is an emirp because it is prime and its reverse (16685609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90658661 - 2⁶ = 90658597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90658651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45329330 + 45329331.

It is an arithmetic number, because the mean of its divisors is an integer number (45329331).

Almost surely, 2^90658661 is an apocalyptic number.

It is an amenable number.

90658661 is a deficient number, since it is larger than the sum of its proper divisors (1).

90658661 is an equidigital number, since it uses as much as digits as its factorization.

90658661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 90658661 is about 9521.4841805256. The cubic root of 90658661 is about 449.2310505717.

It can be divided in two parts, 90658 and 661, that added together give a palindrome (91319).

The spelling of 90658661 in words is "ninety million, six hundred fifty-eight thousand, six hundred sixty-one".