166861520286144 has 56 divisors (see below), whose sum is σ = 448077142195968. Its totient is φ = 54790349940480.

The previous prime is 166861520286101. The next prime is 166861520286173. The reversal of 166861520286144 is 441682025168661.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 6485587272 + ... + 6485612999.

Almost surely, 2^{166861520286144} is an apocalyptic number.

It is an amenable number.

166861520286144 is an abundant number, since it is smaller than the sum of its proper divisors (281215621909824).

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

166861520286144 is a wasteful number, since it uses less digits than its factorization.

166861520286144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12971200353 (or 12971200343 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 60.

The spelling of 166861520286144 in words is "one hundred sixty-six trillion, eight hundred sixty-one billion, five hundred twenty million, two hundred eighty-six thousand, one hundred forty-four".