66100457 has 4 divisors (see below), whose sum is σ = 66120516. Its totient is φ = 66080400.

The previous prime is 66100429. The next prime is 66100499. The reversal of 66100457 is 75400166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53348416 + 12752041 = 7304^2 + 3571^2 .

It is a cyclic number.

It is not a de Polignac number, because 66100457 - 2¹⁰ = 66099433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66102457) 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, 3794 + ... + 12107.

It is an arithmetic number, because the mean of its divisors is an integer number (16530129).

Almost surely, 2^66100457 is an apocalyptic number.

It is an amenable number.

66100457 is a deficient number, since it is larger than the sum of its proper divisors (20059).

66100457 is a wasteful number, since it uses less digits than its factorization.

66100457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20058.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 66100457 is about 8130.2187547445. The cubic root of 66100457 is about 404.3289339056.

The spelling of 66100457 in words is "sixty-six million, one hundred thousand, four hundred fifty-seven".