23991272477 has 2 divisors, whose sum is σ = 23991272478. Its totient is φ = 23991272476.

The previous prime is 23991272441. The next prime is 23991272479. The reversal of 23991272477 is 77427219932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15018257401 + 8973015076 = 122549^2 + 94726^2 .

It is a cyclic number.

It is not a de Polignac number, because 23991272477 - 2⁶ = 23991272413 is a prime.

Together with 23991272479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23991272479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11995636238 + 11995636239.

It is an arithmetic number, because the mean of its divisors is an integer number (11995636239).

Almost surely, 2^23991272477 is an apocalyptic number.

It is an amenable number.

23991272477 is a deficient number, since it is larger than the sum of its proper divisors (1).

23991272477 is an equidigital number, since it uses as much as digits as its factorization.

23991272477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2667168, while the sum is 53.

The spelling of 23991272477 in words is "twenty-three billion, nine hundred ninety-one million, two hundred seventy-two thousand, four hundred seventy-seven".