6664332557 has 2 divisors, whose sum is σ = 6664332558. Its totient is φ = 6664332556.

The previous prime is 6664332497. The next prime is 6664332583. The reversal of 6664332557 is 7552334666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5669939401 + 994393156 = 75299^2 + 31534^2 .

It is a cyclic number.

It is not a de Polignac number, because 6664332557 - 2²² = 6660138253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6664332457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332166278 + 3332166279.

It is an arithmetic number, because the mean of its divisors is an integer number (3332166279).

Almost surely, 2^6664332557 is an apocalyptic number.

It is an amenable number.

6664332557 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664332557 is an equidigital number, since it uses as much as digits as its factorization.

6664332557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 47.

The square root of 6664332557 is about 81635.3633972435. The cubic root of 6664332557 is about 1881.8523839938.

The spelling of 6664332557 in words is "six billion, six hundred sixty-four million, three hundred thirty-two thousand, five hundred fifty-seven".