99623440661 has 2 divisors, whose sum is σ = 99623440662. Its totient is φ = 99623440660.

The previous prime is 99623440633. The next prime is 99623440667. The reversal of 99623440661 is 16604432699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99483468100 + 139972561 = 315410^2 + 11831^2 .

It is a cyclic number.

It is not a de Polignac number, because 99623440661 - 2¹⁰ = 99623439637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99623440667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49811720330 + 49811720331.

It is an arithmetic number, because the mean of its divisors is an integer number (49811720331).

Almost surely, 2^99623440661 is an apocalyptic number.

It is an amenable number.

99623440661 is a deficient number, since it is larger than the sum of its proper divisors (1).

99623440661 is an equidigital number, since it uses as much as digits as its factorization.

99623440661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 50.

The spelling of 99623440661 in words is "ninety-nine billion, six hundred twenty-three million, four hundred forty thousand, six hundred sixty-one".