66378583 has 4 divisors (see below), whose sum is σ = 66417048. Its totient is φ = 66340120.

The previous prime is 66378577. The next prime is 66378589. The reversal of 66378583 is 38587366.

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

It is an interprime number because it is at equal distance from previous prime (66378577) and next prime (66378589).

It is a cyclic number.

It is not a de Polignac number, because 66378583 - 2⁵ = 66378551 is a prime.

It is a super-2 number, since 2×66378583² = 8812232562175778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66378589) 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, 16516 + ... + 20137.

It is an arithmetic number, because the mean of its divisors is an integer number (16604262).

Almost surely, 2^66378583 is an apocalyptic number.

66378583 is a deficient number, since it is larger than the sum of its proper divisors (38465).

66378583 is a wasteful number, since it uses less digits than its factorization.

66378583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38464.

The product of its digits is 725760, while the sum is 46.

The square root of 66378583 is about 8147.3052600231. The cubic root of 66378583 is about 404.8952287031.

The spelling of 66378583 in words is "sixty-six million, three hundred seventy-eight thousand, five hundred eighty-three".