42556545666 has 32 divisors (see below), whose sum is σ = 94635993600. Its totient is φ = 14175631440.

The previous prime is 42556545653. The next prime is 42556545701. The reversal of 42556545666 is 66654565524.

It is a happy number.

It is a super-2 number, since 2×42556545666² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196125 + ... + 351536.

It is an arithmetic number, because the mean of its divisors is an integer number (2957374800).

Almost surely, 2^42556545666 is an apocalyptic number.

42556545666 is an abundant number, since it is smaller than the sum of its proper divisors (52079447934).

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

42556545666 is a wasteful number, since it uses less digits than its factorization.

42556545666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549111 (or 549105 counting only the distinct ones).

The product of its digits is 25920000, while the sum is 54.

The spelling of 42556545666 in words is "forty-two billion, five hundred fifty-six million, five hundred forty-five thousand, six hundred sixty-six".