166040808448640 has 64 divisors (see below), whose sum is σ = 396952923749760. Its totient is φ = 66414379779072.

The previous prime is 166040808448637. The next prime is 166040808448679. The reversal of 166040808448640 is 46844808040661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 166040808448640.

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, 18190349 + ... + 25748211.

It is an arithmetic number, because the mean of its divisors is an integer number (6202389433590).

Almost surely, 2^{166040808448640} is an apocalyptic number.

166040808448640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166040808448640 is an abundant number, since it is smaller than the sum of its proper divisors (230912115301120).

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

166040808448640 is an equidigital number, since it uses as much as digits as its factorization.

166040808448640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7592209 (or 7592197 counting only the distinct ones).

The product of its (nonzero) digits is 28311552, while the sum is 59.

The spelling of 166040808448640 in words is "one hundred sixty-six trillion, forty billion, eight hundred eight million, four hundred forty-eight thousand, six hundred forty".