166699223040 has 576 divisors, whose sum is σ = 631228852800. Its totient is φ = 37436915712.

The previous prime is 166699223039. The next prime is 166699223129. The reversal of 166699223040 is 40322996661.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88810582 + ... + 88812458.

It is an arithmetic number, because the mean of its divisors is an integer number (1095883425).

Almost surely, 2^166699223040 is an apocalyptic number.

166699223040 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 166699223040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315614426400).

166699223040 is an abundant number, since it is smaller than the sum of its proper divisors (464529629760).

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

166699223040 is a wasteful number, since it uses less digits than its factorization.

166699223040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980 (or 1953 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 48.

The spelling of 166699223040 in words is "one hundred sixty-six billion, six hundred ninety-nine million, two hundred twenty-three thousand, forty".