66125739 has 8 divisors (see below), whose sum is σ = 88291840. Its totient is φ = 44021736.

The previous prime is 66125707. The next prime is 66125749. The reversal of 66125739 is 93752166.

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

It is not a de Polignac number, because 66125739 - 2⁵ = 66125707 is a prime.

It is a super-2 number, since 2×66125739² = 8745226716592242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66125697 and 66125706.

It is not an unprimeable number, because it can be changed into a prime (66125749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12979 + ... + 17340.

It is an arithmetic number, because the mean of its divisors is an integer number (11036480).

Almost surely, 2^66125739 is an apocalyptic number.

66125739 is a deficient number, since it is larger than the sum of its proper divisors (22166101).

66125739 is a wasteful number, since it uses less digits than its factorization.

66125739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31049.

The product of its digits is 68040, while the sum is 39.

The square root of 66125739 is about 8131.7734228150. The cubic root of 66125739 is about 404.3804763688.

The spelling of 66125739 in words is "sixty-six million, one hundred twenty-five thousand, seven hundred thirty-nine".