6645757 has 2 divisors, whose sum is σ = 6645758. Its totient is φ = 6645756.

The previous prime is 6645739. The next prime is 6645787. The reversal of 6645757 is 7575466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6046681 + 599076 = 2459^2 + 774^2 .

It is a cyclic number.

It is not a de Polignac number, because 6645757 - 2¹⁹ = 6121469 is a prime.

It is a super-2 number, since 2×6645757² = 88332172206098, which contains 22 as substring.

6645757 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6645787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322878 + 3322879.

It is an arithmetic number, because the mean of its divisors is an integer number (3322879).

Almost surely, 2^6645757 is an apocalyptic number.

It is an amenable number.

6645757 is a deficient number, since it is larger than the sum of its proper divisors (1).

6645757 is an equidigital number, since it uses as much as digits as its factorization.

6645757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 40.

The square root of 6645757 is about 2577.9365779631. The cubic root of 6645757 is about 188.0102322030.

The spelling of 6645757 in words is "six million, six hundred forty-five thousand, seven hundred fifty-seven".