166645201284 has 45 divisors (see below), whose sum is σ = 435662683687. Its totient is φ = 55545951096.

The previous prime is 166645201277. The next prime is 166645201291. The reversal of 166645201284 is 482102546661.

It is a happy number.

The square root of 166645201284 is 408222.

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

It is an interprime number because it is at equal distance from previous prime (166645201277) and next prime (166645201291).

It is a super-2 number, since 2×166645201284² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 7336657 + ... + 7359335.

Almost surely, 2^166645201284 is an apocalyptic number.

166645201284 is the 408222-nd square number.

It is an amenable number.

166645201284 is an abundant number, since it is smaller than the sum of its proper divisors (269017482403).

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

166645201284 is an frugal number, since it uses more digits than its factorization.

166645201284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45374 (or 22684 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 166645201284 in words is "one hundred sixty-six billion, six hundred forty-five million, two hundred one thousand, two hundred eighty-four".