66959859 has 4 divisors (see below), whose sum is σ = 89279816. Its totient is φ = 44639904.

The previous prime is 66959833. The next prime is 66959873. The reversal of 66959859 is 95895966.

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

It is not a de Polignac number, because 66959859 - 2⁷ = 66959731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66959799 and 66959808.

It is not an unprimeable number, because it can be changed into a prime (66959359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11159974 + ... + 11159979.

It is an arithmetic number, because the mean of its divisors is an integer number (22319954).

Almost surely, 2^66959859 is an apocalyptic number.

66959859 is a deficient number, since it is larger than the sum of its proper divisors (22319957).

66959859 is a wasteful number, since it uses less digits than its factorization.

66959859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22319956.

The product of its digits is 5248800, while the sum is 57.

The square root of 66959859 is about 8182.9004026690. The cubic root of 66959859 is about 406.0736820982.

The spelling of 66959859 in words is "sixty-six million, nine hundred fifty-nine thousand, eight hundred fifty-nine".