23778812513 has 4 divisors (see below), whose sum is σ = 23789973168. Its totient is φ = 23767651860.

The previous prime is 23778812503. The next prime is 23778812521. The reversal of 23778812513 is 31521887732.

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 23778812513 - 2²⁸ = 23510377057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23778812503) 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, 5577131 + ... + 5581392.

It is an arithmetic number, because the mean of its divisors is an integer number (5947493292).

Almost surely, 2^23778812513 is an apocalyptic number.

It is an amenable number.

23778812513 is a deficient number, since it is larger than the sum of its proper divisors (11160655).

23778812513 is a wasteful number, since it uses less digits than its factorization.

23778812513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11160654.

The product of its digits is 564480, while the sum is 47.

The spelling of 23778812513 in words is "twenty-three billion, seven hundred seventy-eight million, eight hundred twelve thousand, five hundred thirteen".