18154328644 has 9 divisors (see below), whose sum is σ = 31770546717. Its totient is φ = 9077029584.

The previous prime is 18154328641. The next prime is 18154328653. The reversal of 18154328644 is 44682345181.

The square root of 18154328644 is 134738.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 26399044 + 18127929600 = 5138^2 + 134640^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18154328594 and 18154328603.

It is not an unprimeable number, because it can be changed into a prime (18154328641) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 235792 + ... + 303160.

Almost surely, 2^18154328644 is an apocalyptic number.

18154328644 is the 134738-th square number.

It is an amenable number.

18154328644 is a deficient number, since it is larger than the sum of its proper divisors (13616218073).

18154328644 is an frugal number, since it uses more digits than its factorization.

18154328644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134742 (or 67371 counting only the distinct ones).

The product of its digits is 737280, while the sum is 46.

The spelling of 18154328644 in words is "eighteen billion, one hundred fifty-four million, three hundred twenty-eight thousand, six hundred forty-four".