66125740 has 12 divisors (see below), whose sum is σ = 138864096. Its totient is φ = 26450288.

The previous prime is 66125707. The next prime is 66125749. The reversal of 66125740 is 4752166.

It is a happy number.

It is a super-2 number, since 2×66125740² = 8745226981095200, which contains 22 as substring.

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, 1653124 + ... + 1653163.

It is an arithmetic number, because the mean of its divisors is an integer number (11572008).

Almost surely, 2^66125740 is an apocalyptic number.

It is an amenable number.

66125740 is an abundant number, since it is smaller than the sum of its proper divisors (72738356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66125740 is a wasteful number, since it uses less digits than its factorization.

66125740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3306296 (or 3306294 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 66125740 is about 8131.7734843022. The cubic root of 66125740 is about 404.3804784073.

The spelling of 66125740 in words is "sixty-six million, one hundred twenty-five thousand, seven hundred forty".