66431461 has 4 divisors (see below), whose sum is σ = 70339212. Its totient is φ = 62523712.

The previous prime is 66431459. The next prime is 66431473. The reversal of 66431461 is 16413466.

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 30802500 + 35628961 = 5550^2 + 5969^2 .

It is a cyclic number.

It is not a de Polignac number, because 66431461 - 2¹ = 66431459 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 (66431441) 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, 1953850 + ... + 1953883.

It is an arithmetic number, because the mean of its divisors is an integer number (17584803).

Almost surely, 2^66431461 is an apocalyptic number.

It is an amenable number.

66431461 is a deficient number, since it is larger than the sum of its proper divisors (3907751).

66431461 is a wasteful number, since it uses less digits than its factorization.

66431461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3907750.

The product of its digits is 10368, while the sum is 31.

The square root of 66431461 is about 8150.5497360608. The cubic root of 66431461 is about 405.0027150151.

The spelling of 66431461 in words is "sixty-six million, four hundred thirty-one thousand, four hundred sixty-one".