23991757709 has 2 divisors, whose sum is σ = 23991757710. Its totient is φ = 23991757708.

The previous prime is 23991757697. The next prime is 23991757733. The reversal of 23991757709 is 90775719932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13299163684 + 10692594025 = 115322^2 + 103405^2 .

It is a cyclic number.

It is not a de Polignac number, because 23991757709 - 2¹² = 23991753613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23991757409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11995878854 + 11995878855.

It is an arithmetic number, because the mean of its divisors is an integer number (11995878855).

Almost surely, 2^23991757709 is an apocalyptic number.

It is an amenable number.

23991757709 is a deficient number, since it is larger than the sum of its proper divisors (1).

23991757709 is an equidigital number, since it uses as much as digits as its factorization.

23991757709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7501410, while the sum is 59.

The spelling of 23991757709 in words is "twenty-three billion, nine hundred ninety-one million, seven hundred fifty-seven thousand, seven hundred nine".