18161488801 has 4 divisors (see below), whose sum is σ = 18170337172. Its totient is φ = 18152640432.

The previous prime is 18161488769. The next prime is 18161488811. The reversal of 18161488801 is 10888416181.

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 3091471201 + 15070017600 = 55601^2 + 122760^2 .

It is a cyclic number.

It is not a de Polignac number, because 18161488801 - 2⁵ = 18161488769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18161488811) 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, 4421106 + ... + 4425211.

It is an arithmetic number, because the mean of its divisors is an integer number (4542584293).

Almost surely, 2^18161488801 is an apocalyptic number.

It is an amenable number.

18161488801 is a deficient number, since it is larger than the sum of its proper divisors (8848371).

18161488801 is an equidigital number, since it uses as much as digits as its factorization.

18161488801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8848370.

The product of its (nonzero) digits is 98304, while the sum is 46.

The spelling of 18161488801 in words is "eighteen billion, one hundred sixty-one million, four hundred eighty-eight thousand, eight hundred one".