166316521712 has 80 divisors (see below), whose sum is σ = 356110100352. Its totient is φ = 74619183360.

The previous prime is 166316521703. The next prime is 166316521727. The reversal of 166316521712 is 217125613661.

It is a happy number.

It is a super-2 number, since 2×166316521712² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166316521712.

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, 5200523 + ... + 5232405.

Almost surely, 2^166316521712 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 166316521712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178055050176).

166316521712 is an abundant number, since it is smaller than the sum of its proper divisors (189793578640).

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

166316521712 is a wasteful number, since it uses less digits than its factorization.

166316521712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32286 (or 32280 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The spelling of 166316521712 in words is "one hundred sixty-six billion, three hundred sixteen million, five hundred twenty-one thousand, seven hundred twelve".