66859401 has 16 divisors (see below), whose sum is σ = 102819200. Its totient is φ = 37853568.

The previous prime is 66859393. The next prime is 66859439. The reversal of 66859401 is 10495866.

It is not a de Polignac number, because 66859401 - 2³ = 66859393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66859401.

It is not an unprimeable number, because it can be changed into a prime (66859451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12316 + ... + 16893.

It is an arithmetic number, because the mean of its divisors is an integer number (6426200).

Almost surely, 2^66859401 is an apocalyptic number.

It is an amenable number.

66859401 is a deficient number, since it is larger than the sum of its proper divisors (35959799).

66859401 is a wasteful number, since it uses less digits than its factorization.

66859401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29328.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 66859401 is about 8176.7598105851. The cubic root of 66859401 is about 405.8705068030.

The spelling of 66859401 in words is "sixty-six million, eight hundred fifty-nine thousand, four hundred one".