6640454241 has 6 divisors (see below), whose sum is σ = 9591767250. Its totient is φ = 4426969488.

The previous prime is 6640454237. The next prime is 6640454251. The reversal of 6640454241 is 1424540466.

6640454241 is a `hidden beast` number, since 6 + 6 + 404 + 5 + 4 + 241 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4052595600 + 2587858641 = 63660^2 + 50871^2 .

It is not a de Polignac number, because 6640454241 - 2² = 6640454237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6640454196 and 6640454205.

It is not an unprimeable number, because it can be changed into a prime (6640454251) 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, 368914116 + ... + 368914133.

It is an arithmetic number, because the mean of its divisors is an integer number (1598627875).

Almost surely, 2^6640454241 is an apocalyptic number.

It is an amenable number.

6640454241 is a deficient number, since it is larger than the sum of its proper divisors (2951313009).

6640454241 is a wasteful number, since it uses less digits than its factorization.

6640454241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737828255 (or 737828252 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The square root of 6640454241 is about 81488.9823289014. The cubic root of 6640454241 is about 1879.6021340979.

The spelling of 6640454241 in words is "six billion, six hundred forty million, four hundred fifty-four thousand, two hundred forty-one".