66442140172530 has 64 divisors (see below), whose sum is σ = 177180029441280. Its totient is φ = 17717805148032.

The previous prime is 66442140172517. The next prime is 66442140172531. The reversal of 66442140172530 is 3527104124466.

66442140172530 is a `hidden beast` number, since 6 + 6 + 4 + 4 + 2 + 1 + 40 + 1 + 72 + 530 = 666.

It is a super-2 number, since 2×66442140172530² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (66442140172531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56609707 + ... + 57771473.

It is an arithmetic number, because the mean of its divisors is an integer number (2768437960020).

Almost surely, 2^{66442140172530} is an apocalyptic number.

66442140172530 is an abundant number, since it is smaller than the sum of its proper divisors (110737889268750).

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

66442140172530 is a wasteful number, since it uses less digits than its factorization.

66442140172530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373600 (or 1373594 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 45.

Adding to 66442140172530 its reverse (3527104124466), we get a palindrome (69969244296996).

The spelling of 66442140172530 in words is "sixty-six trillion, four hundred forty-two billion, one hundred forty million, one hundred seventy-two thousand, five hundred thirty".