22991353661 has 2 divisors, whose sum is σ = 22991353662. Its totient is φ = 22991353660.

The previous prime is 22991353631. The next prime is 22991353681. The reversal of 22991353661 is 16635319922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13037300761 + 9954052900 = 114181^2 + 99770^2 .

It is a cyclic number.

It is not a de Polignac number, because 22991353661 - 2¹⁸ = 22991091517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22991353631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11495676830 + 11495676831.

It is an arithmetic number, because the mean of its divisors is an integer number (11495676831).

Almost surely, 2^22991353661 is an apocalyptic number.

It is an amenable number.

22991353661 is a deficient number, since it is larger than the sum of its proper divisors (1).

22991353661 is an equidigital number, since it uses as much as digits as its factorization.

22991353661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 47.

The spelling of 22991353661 in words is "twenty-two billion, nine hundred ninety-one million, three hundred fifty-three thousand, six hundred sixty-one".