166663636 has 12 divisors (see below), whose sum is σ = 291820480. Its totient is φ = 83286360.

The previous prime is 166663633. The next prime is 166663661. The reversal of 166663636 is 636366661.

It is a junction number, because it is equal to n+sod(n) for n = 166663592 and 166663601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166663633) 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, 2316 + ... + 18403.

Almost surely, 2^166663636 is an apocalyptic number.

It is an amenable number.

166663636 is a deficient number, since it is larger than the sum of its proper divisors (125156844).

166663636 is a wasteful number, since it uses less digits than its factorization.

166663636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22734 (or 22732 counting only the distinct ones).

The product of its digits is 419904, while the sum is 43.

The square root of 166663636 is about 12909.8271096092. The cubic root of 166663636 is about 550.3178724486.

It can be divided in two parts, 16666 and 3636, that added together give a palindrome (20302).

The spelling of 166663636 in words is "one hundred sixty-six million, six hundred sixty-three thousand, six hundred thirty-six".