66859407 has 12 divisors (see below), whose sum is σ = 99185320. Its totient is φ = 43368048.

The previous prime is 66859393. The next prime is 66859439. The reversal of 66859407 is 70495866.

It is not a de Polignac number, because 66859407 - 2⁴ = 66859391 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66859307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100057 + ... + 100722.

Almost surely, 2^66859407 is an apocalyptic number.

66859407 is a deficient number, since it is larger than the sum of its proper divisors (32325913).

66859407 is a wasteful number, since it uses less digits than its factorization.

66859407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200822 (or 200819 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 66859407 is about 8176.7601774786. The cubic root of 66859407 is about 405.8705189440.

The spelling of 66859407 in words is "sixty-six million, eight hundred fifty-nine thousand, four hundred seven".