1666417936 has 20 divisors (see below), whose sum is σ = 3229538832. Its totient is φ = 832988576.

The previous prime is 1666417931. The next prime is 1666417943. The reversal of 1666417936 is 6397146661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1666417936.

It is not an unprimeable number, because it can be changed into a prime (1666417931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60855 + ... + 83881.

Almost surely, 2^1666417936 is an apocalyptic number.

1666417936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666417936 is a deficient number, since it is larger than the sum of its proper divisors (1563120896).

1666417936 is a wasteful number, since it uses less digits than its factorization.

1666417936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27558 (or 27552 counting only the distinct ones).

The product of its digits is 979776, while the sum is 49.

The square root of 1666417936 is about 40821.7826166374. The cubic root of 1666417936 is about 1185.5721179995.

The spelling of 1666417936 in words is "one billion, six hundred sixty-six million, four hundred seventeen thousand, nine hundred thirty-six".