23735721389 has 2 divisors, whose sum is σ = 23735721390. Its totient is φ = 23735721388.

The previous prime is 23735721349. The next prime is 23735721413. The reversal of 23735721389 is 98312753732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22582575625 + 1153145764 = 150275^2 + 33958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23735721389 is a prime.

It is a super-3 number, since 3×23735721389³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23735721349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11867860694 + 11867860695.

It is an arithmetic number, because the mean of its divisors is an integer number (11867860695).

Almost surely, 2^23735721389 is an apocalyptic number.

It is an amenable number.

23735721389 is a deficient number, since it is larger than the sum of its proper divisors (1).

23735721389 is an equidigital number, since it uses as much as digits as its factorization.

23735721389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 50.

The spelling of 23735721389 in words is "twenty-three billion, seven hundred thirty-five million, seven hundred twenty-one thousand, three hundred eighty-nine".