66106857 has 4 divisors (see below), whose sum is σ = 88142480. Its totient is φ = 44071236.

The previous prime is 66106813. The next prime is 66106877. The reversal of 66106857 is 75860166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66106857 - 2¹⁰ = 66105833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66106877) 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, 11017807 + ... + 11017812.

It is an arithmetic number, because the mean of its divisors is an integer number (22035620).

Almost surely, 2^66106857 is an apocalyptic number.

It is an amenable number.

66106857 is a deficient number, since it is larger than the sum of its proper divisors (22035623).

66106857 is a wasteful number, since it uses less digits than its factorization.

66106857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22035622.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 66106857 is about 8130.6123385634. The cubic root of 66106857 is about 404.3419828405.

The spelling of 66106857 in words is "sixty-six million, one hundred six thousand, eight hundred fifty-seven".