166553321256444 has 24 divisors (see below), whose sum is σ = 389777604453328. Its totient is φ = 55353032582400.

The previous prime is 166553321256403. The next prime is 166553321256461. The reversal of 166553321256444 is 444652123355661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20592642007 + ... + 20592650094.

Almost surely, 2^{166553321256444} is an apocalyptic number.

It is an amenable number.

166553321256444 is an abundant number, since it is smaller than the sum of its proper divisors (223224283196884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166553321256444 is a wasteful number, since it uses less digits than its factorization.

166553321256444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41185292445 (or 41185292443 counting only the distinct ones).

The product of its digits is 62208000, while the sum is 57.

The spelling of 166553321256444 in words is "one hundred sixty-six trillion, five hundred fifty-three billion, three hundred twenty-one million, two hundred fifty-six thousand, four hundred forty-four".