66512073 has 4 divisors (see below), whose sum is σ = 88682768. Its totient is φ = 44341380.

The previous prime is 66512063. The next prime is 66512077. The reversal of 66512073 is 37021566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66512073 - 2⁶ = 66512009 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 66512073.

It is not an unprimeable number, because it can be changed into a prime (66512077) 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, 11085343 + ... + 11085348.

It is an arithmetic number, because the mean of its divisors is an integer number (22170692).

Almost surely, 2^66512073 is an apocalyptic number.

It is an amenable number.

66512073 is a deficient number, since it is larger than the sum of its proper divisors (22170695).

66512073 is a wasteful number, since it uses less digits than its factorization.

66512073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22170694.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 66512073 is about 8155.4934246801. The cubic root of 66512073 is about 405.1664671567.

The spelling of 66512073 in words is "sixty-six million, five hundred twelve thousand, seventy-three".