66612365 has 4 divisors (see below), whose sum is σ = 79934844. Its totient is φ = 53289888.

The previous prime is 66612349. The next prime is 66612367. The reversal of 66612365 is 56321666.

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 7414729 + 59197636 = 2723^2 + 7694^2 .

It is a cyclic number.

It is not a de Polignac number, because 66612365 - 2⁴ = 66612349 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 (66612367) 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, 6661232 + ... + 6661241.

It is an arithmetic number, because the mean of its divisors is an integer number (19983711).

Almost surely, 2^66612365 is an apocalyptic number.

It is an amenable number.

66612365 is a deficient number, since it is larger than the sum of its proper divisors (13322479).

66612365 is a wasteful number, since it uses less digits than its factorization.

66612365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13322478.

The product of its digits is 38880, while the sum is 35.

The square root of 66612365 is about 8161.6398474816. The cubic root of 66612365 is about 405.3700118989.

It can be divided in two parts, 666 and 12365, that added together give a palindrome (13031).

The spelling of 66612365 in words is "sixty-six million, six hundred twelve thousand, three hundred sixty-five".