66454361 has 4 divisors (see below), whose sum is σ = 66525924. Its totient is φ = 66382800.

The previous prime is 66454327. The next prime is 66454369. The reversal of 66454361 is 16345466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49970761 + 16483600 = 7069^2 + 4060^2 .

It is a cyclic number.

It is not a de Polignac number, because 66454361 - 2¹⁰ = 66453337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66454369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34370 + ... + 36251.

It is an arithmetic number, because the mean of its divisors is an integer number (16631481).

Almost surely, 2^66454361 is an apocalyptic number.

It is an amenable number.

66454361 is a deficient number, since it is larger than the sum of its proper divisors (71563).

66454361 is an equidigital number, since it uses as much as digits as its factorization.

66454361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71562.

The product of its digits is 51840, while the sum is 35.

The square root of 66454361 is about 8151.9544282338. The cubic root of 66454361 is about 405.0492466661.

The spelling of 66454361 in words is "sixty-six million, four hundred fifty-four thousand, three hundred sixty-one".