66914775 has 24 divisors (see below), whose sum is σ = 122926160. Its totient is φ = 35687520.

The previous prime is 66914761. The next prime is 66914777. The reversal of 66914775 is 57741966.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-66914775 is a prime.

It is a super-2 number, since 2×66914775² = 8955174226601250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66914775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66914777) 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 23 ways as a sum of consecutive naturals, for example, 48892 + ... + 50241.

Almost surely, 2^66914775 is an apocalyptic number.

66914775 is a deficient number, since it is larger than the sum of its proper divisors (56011385).

66914775 is a wasteful number, since it uses less digits than its factorization.

66914775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99152 (or 99141 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 66914775 is about 8180.1451698610. The cubic root of 66914775 is about 405.9825253142.

The spelling of 66914775 in words is "sixty-six million, nine hundred fourteen thousand, seven hundred seventy-five".