66386461 has 4 divisors (see below), whose sum is σ = 66520000. Its totient is φ = 66252924.

The previous prime is 66386449. The next prime is 66386497. The reversal of 66386461 is 16468366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16468366 = 2 ⋅8234183.

It is a cyclic number.

It is not a de Polignac number, because 66386461 - 2⁵ = 66386429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66386401) 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 3 ways as a sum of consecutive naturals, for example, 66021 + ... + 67018.

It is an arithmetic number, because the mean of its divisors is an integer number (16630000).

Almost surely, 2^66386461 is an apocalyptic number.

It is an amenable number.

66386461 is a deficient number, since it is larger than the sum of its proper divisors (133539).

66386461 is a wasteful number, since it uses less digits than its factorization.

66386461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133538.

The product of its digits is 124416, while the sum is 40.

The square root of 66386461 is about 8147.7887184192. The cubic root of 66386461 is about 404.9112461105.

The spelling of 66386461 in words is "sixty-six million, three hundred eighty-six thousand, four hundred sixty-one".