66440132 has 18 divisors (see below), whose sum is σ = 127802094. Its totient is φ = 30199840.

The previous prime is 66440119. The next prime is 66440137. The reversal of 66440132 is 23104466.

66440132 = T₂₆₃ + T₂₆₄ + ... + T₇₄₆.

It can be written as a sum of positive squares in only one way, i.e., 65545216 + 894916 = 8096^2 + 946^2 .

It is a super-2 number, since 2×66440132² = 8828582280354848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66440137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68153 + ... + 69120.

Almost surely, 2^66440132 is an apocalyptic number.

It is an amenable number.

66440132 is a deficient number, since it is larger than the sum of its proper divisors (61361962).

66440132 is a wasteful number, since it uses less digits than its factorization.

66440132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137299 (or 137286 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 66440132 is about 8151.0816460148. The cubic root of 66440132 is about 405.0203353098.

Adding to 66440132 its reverse (23104466), we get a palindrome (89544598).

The spelling of 66440132 in words is "sixty-six million, four hundred forty thousand, one hundred thirty-two".