66261379 has 16 divisors (see below), whose sum is σ = 71226400. Its totient is φ = 61461504.

The previous prime is 66261347. The next prime is 66261401. The reversal of 66261379 is 97316266.

66261379 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66261379 - 2⁵ = 66261347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66261179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289237 + ... + 289465.

It is an arithmetic number, because the mean of its divisors is an integer number (4451650).

Almost surely, 2^66261379 is an apocalyptic number.

66261379 is a deficient number, since it is larger than the sum of its proper divisors (4965021).

66261379 is a wasteful number, since it uses less digits than its factorization.

66261379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502.

The product of its digits is 81648, while the sum is 40.

The square root of 66261379 is about 8140.1092744508. The cubic root of 66261379 is about 404.6567818219.

The spelling of 66261379 in words is "sixty-six million, two hundred sixty-one thousand, three hundred seventy-nine".