18998281695601 has 4 divisors (see below), whose sum is σ = 20459687979892. Its totient is φ = 17536875411312.

The previous prime is 18998281695577. The next prime is 18998281695641. The reversal of 18998281695601 is 10659618289981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1884538656225 + 17113743039376 = 1372785^2 + 4136876^2 .

It is a cyclic number.

It is not a de Polignac number, because 18998281695601 - 2⁷ = 18998281695473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18998281695641) 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, 730703142126 + ... + 730703142151.

It is an arithmetic number, because the mean of its divisors is an integer number (5114921994973).

Almost surely, 2^{18998281695601} is an apocalyptic number.

It is an amenable number.

18998281695601 is a deficient number, since it is larger than the sum of its proper divisors (1461406284291).

18998281695601 is a wasteful number, since it uses less digits than its factorization.

18998281695601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461406284290.

The product of its (nonzero) digits is 134369280, while the sum is 73.

The spelling of 18998281695601 in words is "eighteen trillion, nine hundred ninety-eight billion, two hundred eighty-one million, six hundred ninety-five thousand, six hundred one".