18650545489 has 9 divisors (see below), whose sum is σ = 19173432411. Its totient is φ = 18141560280.

The previous prime is 18650545481. The next prime is 18650545523. The reversal of 18650545489 is 98454505681.

The square root of 18650545489 is 136567.

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., 16688764225 + 1961781264 = 129185^2 + 44292^2 .

It is not a de Polignac number, because 18650545489 - 2³ = 18650545481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18650545481) 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, 5051134 + ... + 5054824.

It is an arithmetic number, because the mean of its divisors is an integer number (2130381379).

Almost surely, 2^18650545489 is an apocalyptic number.

18650545489 is the 136567-th square number.

18650545489 is the 68284-th centered octagonal number.

It is an amenable number.

18650545489 is a deficient number, since it is larger than the sum of its proper divisors (522886922).

18650545489 is an frugal number, since it uses more digits than its factorization.

18650545489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7456 (or 3728 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 55.

The spelling of 18650545489 in words is "eighteen billion, six hundred fifty million, five hundred forty-five thousand, four hundred eighty-nine".