66215402 has 16 divisors (see below), whose sum is σ = 108748224. Its totient is φ = 29988000.

The previous prime is 66215389. The next prime is 66215419. The reversal of 66215402 is 20451266.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 827 + ... + 11537.

It is an arithmetic number, because the mean of its divisors is an integer number (6796764).

Almost surely, 2^66215402 is an apocalyptic number.

66215402 is a deficient number, since it is larger than the sum of its proper divisors (42532822).

66215402 is a wasteful number, since it uses less digits than its factorization.

66215402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11005.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 66215402 is about 8137.2846822512. The cubic root of 66215402 is about 404.5631666574.

Adding to 66215402 its reverse (20451266), we get a palindrome (86666668).

The spelling of 66215402 in words is "sixty-six million, two hundred fifteen thousand, four hundred two".