666155445 has 16 divisors (see below), whose sum is σ = 1067660352. Its totient is φ = 354679040.

The previous prime is 666155443. The next prime is 666155449. The reversal of 666155445 is 544551666.

It is not a de Polignac number, because 666155445 - 2¹ = 666155443 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 666155397 and 666155406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666155443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28551 + ... + 46340.

It is an arithmetic number, because the mean of its divisors is an integer number (66728772).

Almost surely, 2^666155445 is an apocalyptic number.

It is an amenable number.

666155445 is a deficient number, since it is larger than the sum of its proper divisors (401504907).

666155445 is a wasteful number, since it uses less digits than its factorization.

666155445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75492.

The product of its digits is 432000, while the sum is 42.

The square root of 666155445 is about 25809.9873111166. The cubic root of 666155445 is about 873.3571110044.

The spelling of 666155445 in words is "six hundred sixty-six million, one hundred fifty-five thousand, four hundred forty-five".