6657172481 has 6 divisors (see below), whose sum is σ = 7025991282. Its totient is φ = 6306794640.

The previous prime is 6657172433. The next prime is 6657172549. The reversal of 6657172481 is 1842717566.

It can be written as a sum of positive squares in only one way, i.e., 6127758400 + 529414081 = 78280^2 + 23009^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6657172481 is a prime.

It is a super-2 number, since 2×6657172481² = 88635890883567390722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6657172421) 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, 9220100 + ... + 9220821.

It is an arithmetic number, because the mean of its divisors is an integer number (1170998547).

Almost surely, 2^6657172481 is an apocalyptic number.

It is an amenable number.

6657172481 is a deficient number, since it is larger than the sum of its proper divisors (368818801).

6657172481 is a wasteful number, since it uses less digits than its factorization.

6657172481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18440959 (or 18440940 counting only the distinct ones).

The product of its digits is 564480, while the sum is 47.

The square root of 6657172481 is about 81591.4976023850. The cubic root of 6657172481 is about 1881.1781962256.

The spelling of 6657172481 in words is "six billion, six hundred fifty-seven million, one hundred seventy-two thousand, four hundred eighty-one".