13623021691 has 2 divisors, whose sum is σ = 13623021692. Its totient is φ = 13623021690.

The previous prime is 13623021677. The next prime is 13623021767. The reversal of 13623021691 is 19612032631.

It is a weak prime.

It is an emirp because it is prime and its reverse (19612032631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13623021691 - 2⁷ = 13623021563 is a prime.

It is not a weakly prime, because it can be changed into another prime (13623021611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6811510845 + 6811510846.

It is an arithmetic number, because the mean of its divisors is an integer number (6811510846).

Almost surely, 2^13623021691 is an apocalyptic number.

13623021691 is a deficient number, since it is larger than the sum of its proper divisors (1).

13623021691 is an equidigital number, since it uses as much as digits as its factorization.

13623021691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 13623021691 in words is "thirteen billion, six hundred twenty-three million, twenty-one thousand, six hundred ninety-one".