66215414 has 4 divisors (see below), whose sum is σ = 99323124. Its totient is φ = 33107706.

The previous prime is 66215389. The next prime is 66215419. The reversal of 66215414 is 41451266.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66215419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16553852 + ... + 16553855.

It is an arithmetic number, because the mean of its divisors is an integer number (24830781).

Almost surely, 2^66215414 is an apocalyptic number.

66215414 is a deficient number, since it is larger than the sum of its proper divisors (33107710).

66215414 is a wasteful number, since it uses less digits than its factorization.

66215414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33107709.

The product of its digits is 5760, while the sum is 29.

The square root of 66215414 is about 8137.2854195979. The cubic root of 66215414 is about 404.5631910967.

The spelling of 66215414 in words is "sixty-six million, two hundred fifteen thousand, four hundred fourteen".