66469887 has 24 divisors (see below), whose sum is σ = 105373008. Its totient is φ = 40041600.

The previous prime is 66469861. The next prime is 66469901. The reversal of 66469887 is 78896466.

It is not a de Polignac number, because 66469887 - 2⁷ = 66469759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66461887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15187 + ... + 19067.

It is an arithmetic number, because the mean of its divisors is an integer number (4390542).

Almost surely, 2^66469887 is an apocalyptic number.

66469887 is a deficient number, since it is larger than the sum of its proper divisors (38903121).

66469887 is a wasteful number, since it uses less digits than its factorization.

66469887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071 (or 4068 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 66469887 is about 8152.9066595908. The cubic root of 66469887 is about 405.0807886387.

The spelling of 66469887 in words is "sixty-six million, four hundred sixty-nine thousand, eight hundred eighty-seven".