18973561979147 has 2 divisors, whose sum is σ = 18973561979148. Its totient is φ = 18973561979146.

The previous prime is 18973561979143. The next prime is 18973561979167. The reversal of 18973561979147 is 74197916537981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18973561979147 - 2² = 18973561979143 is a prime.

It is not a weakly prime, because it can be changed into another prime (18973561979143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9486780989573 + 9486780989574.

It is an arithmetic number, because the mean of its divisors is an integer number (9486780989574).

Almost surely, 2^{18973561979147} is an apocalyptic number.

18973561979147 is a deficient number, since it is larger than the sum of its proper divisors (1).

18973561979147 is an equidigital number, since it uses as much as digits as its factorization.

18973561979147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720135360, while the sum is 77.

The spelling of 18973561979147 in words is "eighteen trillion, nine hundred seventy-three billion, five hundred sixty-one million, nine hundred seventy-nine thousand, one hundred forty-seven".