66570361 has 16 divisors (see below), whose sum is σ = 80736768. Its totient is φ = 54057600.

The previous prime is 66570359. The next prime is 66570367. The reversal of 66570361 is 16307566.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66570361 - 2¹ = 66570359 is a prime.

It is a super-2 number, since 2×66570361² = 8863225927340642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66570367) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3076 + ... + 11941.

It is an arithmetic number, because the mean of its divisors is an integer number (5046048).

Almost surely, 2^66570361 is an apocalyptic number.

It is an amenable number.

66570361 is a deficient number, since it is larger than the sum of its proper divisors (14166407).

66570361 is a wasteful number, since it uses less digits than its factorization.

66570361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15072.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66570361 is about 8159.0661843130. The cubic root of 66570361 is about 405.2847887715.

The spelling of 66570361 in words is "sixty-six million, five hundred seventy thousand, three hundred sixty-one".