66100093 has 4 divisors (see below), whose sum is σ = 67886620. Its totient is φ = 64313568.

The previous prime is 66100087. The next prime is 66100109. The reversal of 66100093 is 39000166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39000166 = 2 ⋅19500083.

It can be written as a sum of positive squares in 2 ways, for example, as 57350329 + 8749764 = 7573^2 + 2958^2 .

It is a cyclic number.

It is not a de Polignac number, because 66100093 - 2⁹ = 66099581 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 (66100693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893208 + ... + 893281.

It is an arithmetic number, because the mean of its divisors is an integer number (16971655).

Almost surely, 2^66100093 is an apocalyptic number.

It is an amenable number.

66100093 is a deficient number, since it is larger than the sum of its proper divisors (1786527).

66100093 is a wasteful number, since it uses less digits than its factorization.

66100093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786526.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 66100093 is about 8130.1963690922. The cubic root of 66100093 is about 404.3281917221.

The spelling of 66100093 in words is "sixty-six million, one hundred thousand, ninety-three".