66992063 has 4 divisors (see below), whose sum is σ = 67016040. Its totient is φ = 66968088.

The previous prime is 66992047. The next prime is 66992069. The reversal of 66992063 is 36029966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66992063 - 2⁴ = 66992047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66992063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66992069) 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, 7145 + ... + 13602.

It is an arithmetic number, because the mean of its divisors is an integer number (16754010).

Almost surely, 2^66992063 is an apocalyptic number.

66992063 is a deficient number, since it is larger than the sum of its proper divisors (23977).

66992063 is a wasteful number, since it uses less digits than its factorization.

66992063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23976.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 66992063 is about 8184.8679280731. The cubic root of 66992063 is about 406.1387713479.

The spelling of 66992063 in words is "sixty-six million, nine hundred ninety-two thousand, sixty-three".