66401258 has 32 divisors (see below), whose sum is σ = 124564608. Its totient is φ = 25790400.

The previous prime is 66401249. The next prime is 66401261. The reversal of 66401258 is 85210466.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 82916 + ... + 83712.

It is an arithmetic number, because the mean of its divisors is an integer number (3892644).

Almost surely, 2^66401258 is an apocalyptic number.

66401258 is a deficient number, since it is larger than the sum of its proper divisors (58163350).

66401258 is a wasteful number, since it uses less digits than its factorization.

66401258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 66401258 is about 8148.6967056088. The cubic root of 66401258 is about 404.9413276790.

The spelling of 66401258 in words is "sixty-six million, four hundred one thousand, two hundred fifty-eight".