66887775 has 120 divisors (see below), whose sum is σ = 137736720. Its totient is φ = 31933440.

The previous prime is 66887761. The next prime is 66887797. The reversal of 66887775 is 57778866.

It is not a de Polignac number, because 66887775 - 2¹⁸ = 66625631 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 998292 + ... + 998358.

It is an arithmetic number, because the mean of its divisors is an integer number (1147806).

Almost surely, 2^66887775 is an apocalyptic number.

66887775 is an abundant number, since it is smaller than the sum of its proper divisors (70848945).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66887775 is a wasteful number, since it uses less digits than its factorization.

66887775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 121 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 54.

The square root of 66887775 is about 8178.4946658905. The cubic root of 66887775 is about 405.9279135446.

The spelling of 66887775 in words is "sixty-six million, eight hundred eighty-seven thousand, seven hundred seventy-five".