166221778348 has 24 divisors (see below), whose sum is σ = 295719076800. Its totient is φ = 81741790608.

The previous prime is 166221778321. The next prime is 166221778351. The reversal of 166221778348 is 843877122661.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

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, 1337518 + ... + 1456501.

It is an arithmetic number, because the mean of its divisors is an integer number (12321628200).

Almost surely, 2^166221778348 is an apocalyptic number.

It is an amenable number.

166221778348 is a deficient number, since it is larger than the sum of its proper divisors (129497298452).

166221778348 is a wasteful number, since it uses less digits than its factorization.

166221778348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794269 (or 2794267 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 55.

The spelling of 166221778348 in words is "one hundred sixty-six billion, two hundred twenty-one million, seven hundred seventy-eight thousand, three hundred forty-eight".