18144950376721 has 9 divisors (see below), whose sum is σ = 21107425940649. Its totient is φ = 15552789050484.

The previous prime is 18144950376713. The next prime is 18144950376793. The reversal of 18144950376721 is 12767305944181.

The square root of 18144950376721 is 4259689.

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

It is not a de Polignac number, because 18144950376721 - 2³ = 18144950376713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18144950376221) 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, 29513560 + ... + 30122086.

It is an arithmetic number, because the mean of its divisors is an integer number (2345269548961).

It is a 1-persistent number, because it is pandigital, but 2⋅18144950376721 = 36289900753442 is not.

Almost surely, 2^{18144950376721} is an apocalyptic number.

18144950376721 is the 4259689-th square number.

18144950376721 is the 2129845-th centered octagonal number.

It is an amenable number.

18144950376721 is a deficient number, since it is larger than the sum of its proper divisors (2962475563928).

18144950376721 is an frugal number, since it uses more digits than its factorization.

18144950376721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217068 (or 608534 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 18144950376721 in words is "eighteen trillion, one hundred forty-four billion, nine hundred fifty million, three hundred seventy-six thousand, seven hundred twenty-one".