166530417023838 has 96 divisors (see below), whose sum is σ = 394187274731520. Its totient is φ = 46752021469440.

The previous prime is 166530417023819. The next prime is 166530417023849. The reversal of 166530417023838 is 838320714035661.

It is a super-2 number, since 2×166530417023838² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

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, 35263395 + ... + 39706017.

It is an arithmetic number, because the mean of its divisors is an integer number (4106117445120).

Almost surely, 2^{166530417023838} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166530417023838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197093637365760).

166530417023838 is an abundant number, since it is smaller than the sum of its proper divisors (227656857707682).

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

166530417023838 is a wasteful number, since it uses less digits than its factorization.

166530417023838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444862 (or 4444855 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 57.

The spelling of 166530417023838 in words is "one hundred sixty-six trillion, five hundred thirty billion, four hundred seventeen million, twenty-three thousand, eight hundred thirty-eight".