12780390166 has 8 divisors (see below), whose sum is σ = 20179563480. Its totient is φ = 6053869008.

The previous prime is 12780390157. The next prime is 12780390179. The reversal of 12780390166 is 66109308721.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168162991 + ... + 168163066.

It is an arithmetic number, because the mean of its divisors is an integer number (2522445435).

Almost surely, 2^12780390166 is an apocalyptic number.

12780390166 is a deficient number, since it is larger than the sum of its proper divisors (7399173314).

12780390166 is a wasteful number, since it uses less digits than its factorization.

12780390166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336326078.

The product of its (nonzero) digits is 108864, while the sum is 43.

Adding to 12780390166 its reverse (66109308721), we get a palindrome (78889698887).

The spelling of 12780390166 in words is "twelve billion, seven hundred eighty million, three hundred ninety thousand, one hundred sixty-six".