66712453 has 4 divisors (see below), whose sum is σ = 68339628. Its totient is φ = 65085280.

The previous prime is 66712423. The next prime is 66712493. The reversal of 66712453 is 35421766.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18507204 + 48205249 = 4302^2 + 6943^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66712453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66712423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 813526 + ... + 813607.

It is an arithmetic number, because the mean of its divisors is an integer number (17084907).

Almost surely, 2^66712453 is an apocalyptic number.

It is an amenable number.

66712453 is a deficient number, since it is larger than the sum of its proper divisors (1627175).

66712453 is a wasteful number, since it uses less digits than its factorization.

66712453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627174.

The product of its digits is 30240, while the sum is 34.

The square root of 66712453 is about 8167.7691568751. The cubic root of 66712453 is about 405.5729390379.

The spelling of 66712453 in words is "sixty-six million, seven hundred twelve thousand, four hundred fifty-three".