23455644781 has 4 divisors (see below), whose sum is σ = 23458022272. Its totient is φ = 23453267292.

The previous prime is 23455644769. The next prime is 23455644809. The reversal of 23455644781 is 18744655432.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23455644781 - 2⁵ = 23455644749 is a prime.

It is a super-2 number, since 2×23455644781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23455645781) 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, 1173885 + ... + 1193698.

It is an arithmetic number, because the mean of its divisors is an integer number (5864505568).

Almost surely, 2^23455644781 is an apocalyptic number.

It is an amenable number.

23455644781 is a deficient number, since it is larger than the sum of its proper divisors (2377491).

23455644781 is an equidigital number, since it uses as much as digits as its factorization.

23455644781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377490.

The product of its digits is 3225600, while the sum is 49.

The spelling of 23455644781 in words is "twenty-three billion, four hundred fifty-five million, six hundred forty-four thousand, seven hundred eighty-one".