23639681491 has 2 divisors, whose sum is σ = 23639681492. Its totient is φ = 23639681490.

The previous prime is 23639681393. The next prime is 23639681537. The reversal of 23639681491 is 19418693632.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23639681491 - 2⁷ = 23639681363 is a prime.

It is not a weakly prime, because it can be changed into another prime (23639681291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11819840745 + 11819840746.

It is an arithmetic number, because the mean of its divisors is an integer number (11819840746).

Almost surely, 2^23639681491 is an apocalyptic number.

23639681491 is a deficient number, since it is larger than the sum of its proper divisors (1).

23639681491 is an equidigital number, since it uses as much as digits as its factorization.

23639681491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 52.

The spelling of 23639681491 in words is "twenty-three billion, six hundred thirty-nine million, six hundred eighty-one thousand, four hundred ninety-one".