66255861 has 8 divisors (see below), whose sum is σ = 100961344. Its totient is φ = 37860480.

The previous prime is 66255859. The next prime is 66255881. The reversal of 66255861 is 16855266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66255861 - 2¹ = 66255859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66255811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1577500 + ... + 1577541.

It is an arithmetic number, because the mean of its divisors is an integer number (12620168).

Almost surely, 2^66255861 is an apocalyptic number.

It is an amenable number.

66255861 is a deficient number, since it is larger than the sum of its proper divisors (34705483).

66255861 is a wasteful number, since it uses less digits than its factorization.

66255861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3155051.

The product of its digits is 86400, while the sum is 39.

The square root of 66255861 is about 8139.7703284552. The cubic root of 66255861 is about 404.6455487419.

The spelling of 66255861 in words is "sixty-six million, two hundred fifty-five thousand, eight hundred sixty-one".