166683881615 has 8 divisors (see below), whose sum is σ = 201057035568. Its totient is φ = 132656186880.

The previous prime is 166683881599. The next prime is 166683881669. The reversal of 166683881615 is 516188386661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166683881615 - 2⁴ = 166683881599 is a prime.

It is a Duffinian number.

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, 86363741 + ... + 86365670.

It is an arithmetic number, because the mean of its divisors is an integer number (25132129446).

Almost surely, 2^166683881615 is an apocalyptic number.

166683881615 is a deficient number, since it is larger than the sum of its proper divisors (34373153953).

166683881615 is a wasteful number, since it uses less digits than its factorization.

166683881615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172729609.

The product of its digits is 9953280, while the sum is 59.

The spelling of 166683881615 in words is "one hundred sixty-six billion, six hundred eighty-three million, eight hundred eighty-one thousand, six hundred fifteen".