18378375061 has 4 divisors (see below), whose sum is σ = 18611012800. Its totient is φ = 18145737324.

The previous prime is 18378375023. The next prime is 18378375073. The reversal of 18378375061 is 16057387381.

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 a de Polignac number, because none of the positive numbers 2^k-18378375061 is a prime.

It is a pancake number, because a pancake can be divided into 18378375061 parts by 191720 straight cuts.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18378374996 and 18378375014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18378375161) 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, 116318751 + ... + 116318908.

It is an arithmetic number, because the mean of its divisors is an integer number (4652753200).

Almost surely, 2^18378375061 is an apocalyptic number.

It is an amenable number.

18378375061 is a deficient number, since it is larger than the sum of its proper divisors (232637739).

18378375061 is an equidigital number, since it uses as much as digits as its factorization.

18378375061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232637738.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 18378375061 in words is "eighteen billion, three hundred seventy-eight million, three hundred seventy-five thousand, sixty-one".