66115775 has 12 divisors (see below), whose sum is σ = 89436984. Its totient is φ = 48084000.

The previous prime is 66115769. The next prime is 66115799. The reversal of 66115775 is 57751166.

It is not a de Polignac number, because 66115775 - 2⁴ = 66115759 is a prime.

It is a Duffinian number.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 119936 + ... + 120485.

It is an arithmetic number, because the mean of its divisors is an integer number (7453082).

Almost surely, 2^66115775 is an apocalyptic number.

66115775 is a deficient number, since it is larger than the sum of its proper divisors (23321209).

66115775 is a wasteful number, since it uses less digits than its factorization.

66115775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240442 (or 240437 counting only the distinct ones).

The product of its digits is 44100, while the sum is 38.

The square root of 66115775 is about 8131.1607412472. The cubic root of 66115775 is about 404.3601643112.

The spelling of 66115775 in words is "sixty-six million, one hundred fifteen thousand, seven hundred seventy-five".