66345636 has 24 divisors (see below), whose sum is σ = 176921920. Its totient is φ = 18955872.

The previous prime is 66345607. The next prime is 66345637. The reversal of 66345636 is 63654366.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66345594 and 66345603.

It is not an unprimeable number, because it can be changed into a prime (66345637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394831 + ... + 394998.

Almost surely, 2^66345636 is an apocalyptic number.

It is an amenable number.

66345636 is an abundant number, since it is smaller than the sum of its proper divisors (110576284).

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

66345636 is a wasteful number, since it uses less digits than its factorization.

66345636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789843 (or 789841 counting only the distinct ones).

The product of its digits is 233280, while the sum is 39.

The square root of 66345636 is about 8145.2830521720. The cubic root of 66345636 is about 404.8282277206.

It can be divided in two parts, 663456 and 36, that multiplied together give a triangular number (23884416 = T₆₉₁₁).

The spelling of 66345636 in words is "sixty-six million, three hundred forty-five thousand, six hundred thirty-six".