1666445154 has 48 divisors (see below), whose sum is σ = 3789797760. Its totient is φ = 487564000.

The previous prime is 1666445149. The next prime is 1666445161. The reversal of 1666445154 is 4515446661.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18522 + ... + 60629.

It is an arithmetic number, because the mean of its divisors is an integer number (78954120).

Almost surely, 2^1666445154 is an apocalyptic number.

1666445154 is an abundant number, since it is smaller than the sum of its proper divisors (2123352606).

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

1666445154 is a wasteful number, since it uses less digits than its factorization.

1666445154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79207 (or 79196 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The square root of 1666445154 is about 40822.1159912124. The cubic root of 1666445154 is about 1185.5785727081.

The spelling of 1666445154 in words is "one billion, six hundred sixty-six million, four hundred forty-five thousand, one hundred fifty-four".