1206666645 has 48 divisors (see below), whose sum is σ = 1997190720. Its totient is φ = 622073088.

The previous prime is 1206666577. The next prime is 1206666667. The reversal of 1206666645 is 5466666021.

It is a happy number.

It is not a de Polignac number, because 1206666645 - 2²⁰ = 1205618069 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1206666597 and 1206666606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3855009 + ... + 3855321.

It is an arithmetic number, because the mean of its divisors is an integer number (41608140).

Almost surely, 2^1206666645 is an apocalyptic number.

1206666645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1206666645 is a deficient number, since it is larger than the sum of its proper divisors (790524075).

1206666645 is a wasteful number, since it uses less digits than its factorization.

1206666645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 1206666645 is about 34737.1076084351. The cubic root of 1206666645 is about 1064.6228160222.

The spelling of 1206666645 in words is "one billion, two hundred six million, six hundred sixty-six thousand, six hundred forty-five".