23355685729 has 2 divisors, whose sum is σ = 23355685730. Its totient is φ = 23355685728.

The previous prime is 23355685693. The next prime is 23355685733. The reversal of 23355685729 is 92758655332.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17377303329 + 5978382400 = 131823^2 + 77320^2 .

It is a cyclic number.

It is not a de Polignac number, because 23355685729 - 2¹³ = 23355677537 is a prime.

It is a super-2 number, since 2×23355685729² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23355685729.

It is not a weakly prime, because it can be changed into another prime (23355686729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11677842864 + 11677842865.

It is an arithmetic number, because the mean of its divisors is an integer number (11677842865).

Almost surely, 2^23355685729 is an apocalyptic number.

It is an amenable number.

23355685729 is a deficient number, since it is larger than the sum of its proper divisors (1).

23355685729 is an equidigital number, since it uses as much as digits as its factorization.

23355685729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608000, while the sum is 55.

The spelling of 23355685729 in words is "twenty-three billion, three hundred fifty-five million, six hundred eighty-five thousand, seven hundred twenty-nine".