1666412636 has 24 divisors (see below), whose sum is σ = 3403739136. Its totient is φ = 698981040.

The previous prime is 1666412621. The next prime is 1666412647. The reversal of 1666412636 is 6362146661.

It is a junction number, because it is equal to n+sod(n) for n = 1666412593 and 1666412602.

It is a congruent number.

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, 631820 + ... + 634451.

It is an arithmetic number, because the mean of its divisors is an integer number (141822464).

Almost surely, 2^1666412636 is an apocalyptic number.

It is an amenable number.

1666412636 is an abundant number, since it is smaller than the sum of its proper divisors (1737326500).

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

1666412636 is a wasteful number, since it uses less digits than its factorization.

1666412636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266329 (or 1266327 counting only the distinct ones).

The product of its digits is 186624, while the sum is 41.

The square root of 1666412636 is about 40821.7177002634. The cubic root of 1666412636 is about 1185.5708611042.

The spelling of 1666412636 in words is "one billion, six hundred sixty-six million, four hundred twelve thousand, six hundred thirty-six".