66097643 has 4 divisors (see below), whose sum is σ = 66779160. Its totient is φ = 65416128.

The previous prime is 66097639. The next prime is 66097667. The reversal of 66097643 is 34679066.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66097643 - 2² = 66097639 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 66097643.

It is not an unprimeable number, because it can be changed into a prime (66097613) 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, 340613 + ... + 340806.

It is an arithmetic number, because the mean of its divisors is an integer number (16694790).

Almost surely, 2^66097643 is an apocalyptic number.

66097643 is a deficient number, since it is larger than the sum of its proper divisors (681517).

66097643 is an equidigital number, since it uses as much as digits as its factorization.

66097643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681516.

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 66097643 is about 8130.0456948285. The cubic root of 66097643 is about 404.3231961855.

The spelling of 66097643 in words is "sixty-six million, ninety-seven thousand, six hundred forty-three".