23185993729 has 4 divisors (see below), whose sum is σ = 23197423060. Its totient is φ = 23174564400.

The previous prime is 23185993703. The next prime is 23185993757. The reversal of 23185993729 is 92739958132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15242371600 + 7943622129 = 123460^2 + 89127^2 .

It is a cyclic number.

It is not a de Polignac number, because 23185993729 - 2⁵ = 23185993697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23185993429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5711622 + ... + 5715679.

It is an arithmetic number, because the mean of its divisors is an integer number (5799355765).

Almost surely, 2^23185993729 is an apocalyptic number.

It is an amenable number.

23185993729 is a deficient number, since it is larger than the sum of its proper divisors (11429331).

23185993729 is a wasteful number, since it uses less digits than its factorization.

23185993729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11429330.

The product of its digits is 7348320, while the sum is 58.

The spelling of 23185993729 in words is "twenty-three billion, one hundred eighty-five million, nine hundred ninety-three thousand, seven hundred twenty-nine".