66450140 has 12 divisors (see below), whose sum is σ = 139545336. Its totient is φ = 26580048.

The previous prime is 66450101. The next prime is 66450149. The reversal of 66450140 is 4105466.

It is a happy number.

It is a super-2 number, since 2×66450140² = 8831242212039200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66450149) 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, 1661234 + ... + 1661273.

It is an arithmetic number, because the mean of its divisors is an integer number (11628778).

Almost surely, 2^66450140 is an apocalyptic number.

It is an amenable number.

66450140 is an abundant number, since it is smaller than the sum of its proper divisors (73095196).

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

66450140 is a wasteful number, since it uses less digits than its factorization.

66450140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322516 (or 3322514 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 66450140 is about 8151.6955291522. The cubic root of 66450140 is about 405.0406706096.

The spelling of 66450140 in words is "sixty-six million, four hundred fifty thousand, one hundred forty".