166331738478 has 16 divisors (see below), whose sum is σ = 334655475840. Its totient is φ = 55111913016.

The previous prime is 166331738459. The next prime is 166331738509. The reversal of 166331738478 is 874837133661.

It is a super-2 number, since 2×166331738478² (a number of 23 digits) contains 22 as substring.

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, 82998868 + ... + 83000871.

It is an arithmetic number, because the mean of its divisors is an integer number (20915967240).

Almost surely, 2^166331738478 is an apocalyptic number.

166331738478 is an abundant number, since it is smaller than the sum of its proper divisors (168323737362).

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

166331738478 is a wasteful number, since it uses less digits than its factorization.

166331738478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165999911.

The product of its digits is 12192768, while the sum is 57.

The spelling of 166331738478 in words is "one hundred sixty-six billion, three hundred thirty-one million, seven hundred thirty-eight thousand, four hundred seventy-eight".