23721577157 has 2 divisors, whose sum is σ = 23721577158. Its totient is φ = 23721577156.

The previous prime is 23721577141. The next prime is 23721577213. The reversal of 23721577157 is 75177512732.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20009234116 + 3712343041 = 141454^2 + 60929^2 .

It is a cyclic number.

It is not a de Polignac number, because 23721577157 - 2⁴ = 23721577141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23721577357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11860788578 + 11860788579.

It is an arithmetic number, because the mean of its divisors is an integer number (11860788579).

Almost surely, 2^23721577157 is an apocalyptic number.

It is an amenable number.

23721577157 is a deficient number, since it is larger than the sum of its proper divisors (1).

23721577157 is an equidigital number, since it uses as much as digits as its factorization.

23721577157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720300, while the sum is 47.

The spelling of 23721577157 in words is "twenty-three billion, seven hundred twenty-one million, five hundred seventy-seven thousand, one hundred fifty-seven".