23178778017 has 4 divisors (see below), whose sum is σ = 30905037360. Its totient is φ = 15452518676.

The previous prime is 23178778013. The next prime is 23178778019. The reversal of 23178778017 is 71087787132.

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 23178778017 - 2² = 23178778013 is a prime.

It is a super-2 number, since 2×23178778017² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23178778013) 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, 3863129667 + ... + 3863129672.

It is an arithmetic number, because the mean of its divisors is an integer number (7726259340).

Almost surely, 2^23178778017 is an apocalyptic number.

It is an amenable number.

23178778017 is a deficient number, since it is larger than the sum of its proper divisors (7726259343).

23178778017 is an equidigital number, since it uses as much as digits as its factorization.

23178778017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7726259342.

The product of its (nonzero) digits is 921984, while the sum is 51.

The spelling of 23178778017 in words is "twenty-three billion, one hundred seventy-eight million, seven hundred seventy-eight thousand, seventeen".