66125743 has 4 divisors (see below), whose sum is σ = 67738608. Its totient is φ = 64512880.

The previous prime is 66125707. The next prime is 66125749. The reversal of 66125743 is 34752166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66125743 - 2¹⁷ = 65994671 is a prime.

It is a super-2 number, since 2×66125743² = 8745227774604098, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 66125699 and 66125708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66125749) 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, 806371 + ... + 806452.

It is an arithmetic number, because the mean of its divisors is an integer number (16934652).

Almost surely, 2^66125743 is an apocalyptic number.

66125743 is a deficient number, since it is larger than the sum of its proper divisors (1612865).

66125743 is a wasteful number, since it uses less digits than its factorization.

66125743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612864.

The product of its digits is 30240, while the sum is 34.

The square root of 66125743 is about 8131.7736687638. The cubic root of 66125743 is about 404.3804845226.

The spelling of 66125743 in words is "sixty-six million, one hundred twenty-five thousand, seven hundred forty-three".