166644872531386 has 16 divisors (see below), whose sum is σ = 250703028072000. Its totient is φ = 83077512336928.

The previous prime is 166644872531363. The next prime is 166644872531387. The reversal of 166644872531386 is 683135278446661.

It is not an unprimeable number, because it can be changed into a prime (166644872531387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77901316 + ... + 80011903.

It is an arithmetic number, because the mean of its divisors is an integer number (15668939254500).

Almost surely, 2^{166644872531386} is an apocalyptic number.

166644872531386 is a deficient number, since it is larger than the sum of its proper divisors (84058155540614).

166644872531386 is a wasteful number, since it uses less digits than its factorization.

166644872531386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157914773.

The product of its digits is 836075520, while the sum is 70.

The spelling of 166644872531386 in words is "one hundred sixty-six trillion, six hundred forty-four billion, eight hundred seventy-two million, five hundred thirty-one thousand, three hundred eighty-six".