66047405 has 12 divisors (see below), whose sum is σ = 81465300. Its totient is φ = 51404544.

The previous prime is 66047369. The next prime is 66047417. The reversal of 66047405 is 50474066.

It can be written as a sum of positive squares in 6 ways, for example, as 1630729 + 64416676 = 1277^2 + 8026^2 .

It is not a de Polignac number, because 66047405 - 2⁶ = 66047341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2021 + ... + 11669.

It is an arithmetic number, because the mean of its divisors is an integer number (6788775).

Almost surely, 2^66047405 is an apocalyptic number.

It is an amenable number.

66047405 is a deficient number, since it is larger than the sum of its proper divisors (15417895).

66047405 is an equidigital number, since it uses as much as digits as its factorization.

66047405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9728 (or 9691 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 66047405 is about 8126.9554569962. The cubic root of 66047405 is about 404.2207339485.

The spelling of 66047405 in words is "sixty-six million, forty-seven thousand, four hundred five".