166265432920 has 64 divisors (see below), whose sum is σ = 381335934240. Its totient is φ = 65220480000.

The previous prime is 166265432897. The next prime is 166265432951. The reversal of 166265432920 is 29234562661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4754700 + ... + 4789540.

Almost surely, 2^166265432920 is an apocalyptic number.

166265432920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166265432920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190667967120).

166265432920 is an abundant number, since it is smaller than the sum of its proper divisors (215070501320).

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

166265432920 is a wasteful number, since it uses less digits than its factorization.

166265432920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37156 (or 37152 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 166265432920 in words is "one hundred sixty-six billion, two hundred sixty-five million, four hundred thirty-two thousand, nine hundred twenty".