66589895 has 4 divisors (see below), whose sum is σ = 79907880. Its totient is φ = 53271912.

The previous prime is 66589879. The next prime is 66589903. The reversal of 66589895 is 59898566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66589895 - 2⁴ = 66589879 is a prime.

It is a super-2 number, since 2×66589895² = 8868428232222050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66589895.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6658985 + ... + 6658994.

It is an arithmetic number, because the mean of its divisors is an integer number (19976970).

Almost surely, 2^66589895 is an apocalyptic number.

66589895 is a deficient number, since it is larger than the sum of its proper divisors (13317985).

66589895 is a wasteful number, since it uses less digits than its factorization.

66589895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13317984.

The product of its digits is 4665600, while the sum is 56.

The square root of 66589895 is about 8160.2631697758. The cubic root of 66589895 is about 405.3244263255.

The spelling of 66589895 in words is "sixty-six million, five hundred eighty-nine thousand, eight hundred ninety-five".