66147633 has 6 divisors (see below), whose sum is σ = 95546594. Its totient is φ = 44098416.

The previous prime is 66147619. The next prime is 66147643. The reversal of 66147633 is 33674166.

It is a happy number.

66147633 is a `hidden beast` number, since 6 + 6 + 14 + 7 + 633 = 666.

It can be written as a sum of positive squares in only one way, i.e., 52664049 + 13483584 = 7257^2 + 3672^2 .

It is not a de Polignac number, because 66147633 - 2⁴ = 66147617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66147643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3674860 + ... + 3674877.

Almost surely, 2^66147633 is an apocalyptic number.

It is an amenable number.

66147633 is a deficient number, since it is larger than the sum of its proper divisors (29398961).

66147633 is a wasteful number, since it uses less digits than its factorization.

66147633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7349743 (or 7349740 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 66147633 is about 8133.1195122167. The cubic root of 66147633 is about 404.4251010961.

The spelling of 66147633 in words is "sixty-six million, one hundred forty-seven thousand, six hundred thirty-three".