23537568491 has 2 divisors, whose sum is σ = 23537568492. Its totient is φ = 23537568490.

The previous prime is 23537568473. The next prime is 23537568499. The reversal of 23537568491 is 19486573532.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23537568491 - 2²⁶ = 23470459627 is a prime.

It is not a weakly prime, because it can be changed into another prime (23537568499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11768784245 + 11768784246.

It is an arithmetic number, because the mean of its divisors is an integer number (11768784246).

Almost surely, 2^23537568491 is an apocalyptic number.

23537568491 is a deficient number, since it is larger than the sum of its proper divisors (1).

23537568491 is an equidigital number, since it uses as much as digits as its factorization.

23537568491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 53.

The spelling of 23537568491 in words is "twenty-three billion, five hundred thirty-seven million, five hundred sixty-eight thousand, four hundred ninety-one".