66442171532 has 12 divisors (see below), whose sum is σ = 126844145736. Its totient is φ = 30200987040.

The previous prime is 66442171513. The next prime is 66442171571. The reversal of 66442171532 is 23517124466.

It is a super-2 number, since 2×66442171532² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66442171532.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755024633 + ... + 755024720.

It is an arithmetic number, because the mean of its divisors is an integer number (10570345478).

Almost surely, 2^66442171532 is an apocalyptic number.

It is an amenable number.

66442171532 is a deficient number, since it is larger than the sum of its proper divisors (60401974204).

66442171532 is a wasteful number, since it uses less digits than its factorization.

66442171532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510049368 (or 1510049366 counting only the distinct ones).

The product of its digits is 241920, while the sum is 41.

Adding to 66442171532 its reverse (23517124466), we get a palindrome (89959295998).

The spelling of 66442171532 in words is "sixty-six billion, four hundred forty-two million, one hundred seventy-one thousand, five hundred thirty-two".