66152209 has 8 divisors (see below), whose sum is σ = 69664320. Its totient is φ = 62693136.

The previous prime is 66152201. The next prime is 66152221. The reversal of 66152209 is 90225166.

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 66152209 - 2³ = 66152201 is a prime.

It is a super-2 number, since 2×66152209² = 8752229511159362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66152201) 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, 10687 + ... + 15700.

It is an arithmetic number, because the mean of its divisors is an integer number (8708040).

Almost surely, 2^66152209 is an apocalyptic number.

It is an amenable number.

66152209 is a deficient number, since it is larger than the sum of its proper divisors (3512111).

66152209 is a wasteful number, since it uses less digits than its factorization.

66152209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26519.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 66152209 is about 8133.4008262227. The cubic root of 66152209 is about 404.4344267339.

The spelling of 66152209 in words is "sixty-six million, one hundred fifty-two thousand, two hundred nine".