18641533156 has 27 divisors (see below), whose sum is σ = 34439619081. Its totient is φ = 8827742304.

The previous prime is 18641533153. The next prime is 18641533193. The reversal of 18641533156 is 65133514681.

The square root of 18641533156 is 136534.

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., 5921302500 + 12720230656 = 76950^2 + 112784^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18641533153) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5186496 + ... + 5190088.

Almost surely, 2^18641533156 is an apocalyptic number.

18641533156 is the 136534-th square number.

It is an amenable number.

18641533156 is a deficient number, since it is larger than the sum of its proper divisors (15798085925).

18641533156 is an frugal number, since it uses more digits than its factorization.

18641533156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7228 (or 3614 counting only the distinct ones).

The product of its digits is 259200, while the sum is 43.

The spelling of 18641533156 in words is "eighteen billion, six hundred forty-one million, five hundred thirty-three thousand, one hundred fifty-six".