6640532147929 has 9 divisors (see below), whose sum is σ = 6653656499679. Its totient is φ = 6627433648320.

The previous prime is 6640532147923. The next prime is 6640532148007. The reversal of 6640532147929 is 9297412350466.

The square root of 6640532147929 is 2576923.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2942520025 + 6637589627904 = 54245^2 + 2576352^2 .

It is not a de Polignac number, because 6640532147929 - 2¹³ = 6640532139737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6640532147923) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1471420777 + ... + 1471425289.

It is an arithmetic number, because the mean of its divisors is an integer number (739295166631).

Almost surely, 2^{6640532147929} is an apocalyptic number.

6640532147929 is the 2576923-rd square number.

6640532147929 is the 1288462-nd centered octagonal number.

It is an amenable number.

6640532147929 is a deficient number, since it is larger than the sum of its proper divisors (13124351750).

6640532147929 is an frugal number, since it uses more digits than its factorization.

6640532147929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10168 (or 5084 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 58.

The spelling of 6640532147929 in words is "six trillion, six hundred forty billion, five hundred thirty-two million, one hundred forty-seven thousand, nine hundred twenty-nine".