66074561 has 8 divisors (see below), whose sum is σ = 78797184. Its totient is φ = 54172800.

The previous prime is 66074543. The next prime is 66074587. The reversal of 66074561 is 16547066.

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 66074561 - 2¹⁰ = 66073537 is a prime.

It is a super-2 number, since 2×66074561² = 8731695222685442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66074161) 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, 205040 + ... + 205361.

It is an arithmetic number, because the mean of its divisors is an integer number (9849648).

Almost surely, 2^66074561 is an apocalyptic number.

It is an amenable number.

66074561 is a deficient number, since it is larger than the sum of its proper divisors (12722623).

66074561 is a wasteful number, since it uses less digits than its factorization.

66074561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410431.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 66074561 is about 8128.6260216595. The cubic root of 66074561 is about 404.2761260524.

The spelling of 66074561 in words is "sixty-six million, seventy-four thousand, five hundred sixty-one".