66340646 has 4 divisors (see below), whose sum is σ = 99510972. Its totient is φ = 33170322.

The previous prime is 66340639. The next prime is 66340649. The reversal of 66340646 is 64604366.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66340649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16585160 + ... + 16585163.

It is an arithmetic number, because the mean of its divisors is an integer number (24877743).

Almost surely, 2^66340646 is an apocalyptic number.

66340646 is a deficient number, since it is larger than the sum of its proper divisors (33170326).

66340646 is a wasteful number, since it uses less digits than its factorization.

66340646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33170325.

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 66340646 is about 8144.9767341595. The cubic root of 66340646 is about 404.8180781281.

The spelling of 66340646 in words is "sixty-six million, three hundred forty thousand, six hundred forty-six".