66992973 has 16 divisors (see below), whose sum is σ = 90921600. Its totient is φ = 43868160.

The previous prime is 66992969. The next prime is 66992983. The reversal of 66992973 is 37929966.

It is not a de Polignac number, because 66992973 - 2² = 66992969 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66992983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86733 + ... + 87501.

It is an arithmetic number, because the mean of its divisors is an integer number (5682600).

Almost surely, 2^66992973 is an apocalyptic number.

It is an amenable number.

66992973 is a deficient number, since it is larger than the sum of its proper divisors (23928627).

66992973 is a wasteful number, since it uses less digits than its factorization.

66992973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252.

The product of its digits is 1102248, while the sum is 51.

The square root of 66992973 is about 8184.9235182743. The cubic root of 66992973 is about 406.1406102951.

The spelling of 66992973 in words is "sixty-six million, nine hundred ninety-two thousand, nine hundred seventy-three".