66163215 has 32 divisors (see below), whose sum is σ = 109932480. Its totient is φ = 33951744.

The previous prime is 66163213. The next prime is 66163219. The reversal of 66163215 is 51236166.

It is not a de Polignac number, because 66163215 - 2¹ = 66163213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66163213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53221 + ... + 54449.

It is an arithmetic number, because the mean of its divisors is an integer number (3435390).

Almost surely, 2^66163215 is an apocalyptic number.

66163215 is a deficient number, since it is larger than the sum of its proper divisors (43769265).

66163215 is a wasteful number, since it uses less digits than its factorization.

66163215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371.

The product of its digits is 6480, while the sum is 30.

The square root of 66163215 is about 8134.0773908293. The cubic root of 66163215 is about 404.4568545990.

The spelling of 66163215 in words is "sixty-six million, one hundred sixty-three thousand, two hundred fifteen".