23187806781 has 8 divisors (see below), whose sum is σ = 30925776960. Its totient is φ = 15454187232.

The previous prime is 23187806773. The next prime is 23187806827. The reversal of 23187806781 is 18760878132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23187806781 - 2³ = 23187806773 is a prime.

It is a super-2 number, since 2×23187806781² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23187806731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1075200 + ... + 1096553.

It is an arithmetic number, because the mean of its divisors is an integer number (3865722120).

Almost surely, 2^23187806781 is an apocalyptic number.

It is an amenable number.

23187806781 is a deficient number, since it is larger than the sum of its proper divisors (7737970179).

23187806781 is a wasteful number, since it uses less digits than its factorization.

23187806781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175315.

The product of its (nonzero) digits is 903168, while the sum is 51.

The spelling of 23187806781 in words is "twenty-three billion, one hundred eighty-seven million, eight hundred six thousand, seven hundred eighty-one".