166621646312 has 32 divisors (see below), whose sum is σ = 340876680480. Its totient is φ = 75723850560.

The previous prime is 166621646297. The next prime is 166621646363. The reversal of 166621646312 is 213646126661.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348683 + ... + 674405.

It is an arithmetic number, because the mean of its divisors is an integer number (10652396265).

Almost surely, 2^166621646312 is an apocalyptic number.

It is an amenable number.

166621646312 is an abundant number, since it is smaller than the sum of its proper divisors (174255034168).

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

166621646312 is a wasteful number, since it uses less digits than its factorization.

166621646312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331553 (or 331549 counting only the distinct ones).

The product of its digits is 373248, while the sum is 44.

The spelling of 166621646312 in words is "one hundred sixty-six billion, six hundred twenty-one million, six hundred forty-six thousand, three hundred twelve".