6662557757 has 4 divisors (see below), whose sum is σ = 6677137116. Its totient is φ = 6647978400.

The previous prime is 6662557753. The next prime is 6662557763. The reversal of 6662557757 is 7577552666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4649330596 + 2013227161 = 68186^2 + 44869^2 .

It is a cyclic number.

It is not a de Polignac number, because 6662557757 - 2² = 6662557753 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6662557753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7288994 + ... + 7289907.

It is an arithmetic number, because the mean of its divisors is an integer number (1669284279).

Almost surely, 2^6662557757 is an apocalyptic number.

It is an amenable number.

6662557757 is a deficient number, since it is larger than the sum of its proper divisors (14579359).

6662557757 is a wasteful number, since it uses less digits than its factorization.

6662557757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14579358.

The product of its digits is 18522000, while the sum is 56.

The square root of 6662557757 is about 81624.4923843328. The cubic root of 6662557757 is about 1881.6853150931.

The spelling of 6662557757 in words is "six billion, six hundred sixty-two million, five hundred fifty-seven thousand, seven hundred fifty-seven".