166438622088536 has 128 divisors (see below), whose sum is σ = 385771948531200. Its totient is φ = 65716109429760.

The previous prime is 166438622088521. The next prime is 166438622088569. The reversal of 166438622088536 is 635880226834661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74924900 + ... + 77114316.

It is an arithmetic number, because the mean of its divisors is an integer number (3013843347900).

Almost surely, 2^{166438622088536} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166438622088536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192885974265600).

166438622088536 is an abundant number, since it is smaller than the sum of its proper divisors (219333326442664).

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

166438622088536 is a wasteful number, since it uses less digits than its factorization.

166438622088536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191417 (or 2191413 counting only the distinct ones).

The product of its (nonzero) digits is 477757440, while the sum is 68.

The spelling of 166438622088536 in words is "one hundred sixty-six trillion, four hundred thirty-eight billion, six hundred twenty-two million, eighty-eight thousand, five hundred thirty-six".