66975653 has 4 divisors (see below), whose sum is σ = 66992160. Its totient is φ = 66959148.

The previous prime is 66975637. The next prime is 66975659. The reversal of 66975653 is 35657966.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 66975653 - 2⁴ = 66975637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66975598 and 66975607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66975659) 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, 2528 + ... + 11846.

It is an arithmetic number, because the mean of its divisors is an integer number (16748040).

Almost surely, 2^66975653 is an apocalyptic number.

It is an amenable number.

66975653 is a deficient number, since it is larger than the sum of its proper divisors (16507).

66975653 is an equidigital number, since it uses as much as digits as its factorization.

66975653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16506.

The product of its digits is 1020600, while the sum is 47.

The square root of 66975653 is about 8183.8654070066. The cubic root of 66975653 is about 406.1056068147.

The spelling of 66975653 in words is "sixty-six million, nine hundred seventy-five thousand, six hundred fifty-three".