66215433 has 8 divisors (see below), whose sum is σ = 90165888. Its totient is φ = 43204304.

The previous prime is 66215431. The next prime is 66215441. The reversal of 66215433 is 33451266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66215433 - 2¹ = 66215431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66215433.

It is not an unprimeable number, because it can be changed into a prime (66215431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234666 + ... + 234947.

It is an arithmetic number, because the mean of its divisors is an integer number (11270736).

Almost surely, 2^66215433 is an apocalyptic number.

It is an amenable number.

66215433 is a deficient number, since it is larger than the sum of its proper divisors (23950455).

66215433 is a wasteful number, since it uses less digits than its factorization.

66215433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469663.

The product of its digits is 12960, while the sum is 30.

The square root of 66215433 is about 8137.2865870633. The cubic root of 66215433 is about 404.5632297921.

Adding to 66215433 its reverse (33451266), we get a palindrome (99666699).

The spelling of 66215433 in words is "sixty-six million, two hundred fifteen thousand, four hundred thirty-three".