66712953 has 4 divisors (see below), whose sum is σ = 88950608. Its totient is φ = 44475300.

The previous prime is 66712939. The next prime is 66712969. The reversal of 66712953 is 35921766.

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 66712953 - 2⁴ = 66712937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66712153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11118823 + ... + 11118828.

It is an arithmetic number, because the mean of its divisors is an integer number (22237652).

Almost surely, 2^66712953 is an apocalyptic number.

It is an amenable number.

66712953 is a deficient number, since it is larger than the sum of its proper divisors (22237655).

66712953 is a wasteful number, since it uses less digits than its factorization.

66712953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22237654.

The product of its digits is 68040, while the sum is 39.

The square root of 66712953 is about 8167.7997649306. The cubic root of 66712953 is about 405.5739522718.

The spelling of 66712953 in words is "sixty-six million, seven hundred twelve thousand, nine hundred fifty-three".