66345663 has 12 divisors (see below), whose sum is σ = 93363288. Its totient is φ = 41901840.

The previous prime is 66345659. The next prime is 66345691. The reversal of 66345663 is 36654366.

It is a happy number.

It is not a de Polignac number, because 66345663 - 2² = 66345659 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66345163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29548 + ... + 31713.

It is an arithmetic number, because the mean of its divisors is an integer number (7780274).

Almost surely, 2^66345663 is an apocalyptic number.

66345663 is a deficient number, since it is larger than the sum of its proper divisors (27017625).

66345663 is a wasteful number, since it uses less digits than its factorization.

66345663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61302 (or 61283 counting only the distinct ones).

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

The square root of 66345663 is about 8145.2847095728. The cubic root of 66345663 is about 404.8282826369.

The spelling of 66345663 in words is "sixty-six million, three hundred forty-five thousand, six hundred sixty-three".