6660788437 has 4 divisors (see below), whose sum is σ = 6665393056. Its totient is φ = 6656183820.

The previous prime is 6660788423. The next prime is 6660788443. The reversal of 6660788437 is 7348870666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6660788437 - 2¹¹ = 6660786389 is a prime.

It is a super-2 number, since 2×6660788437² = 88732205204945805938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660788837) 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, 2300139 + ... + 2303032.

It is an arithmetic number, because the mean of its divisors is an integer number (1666348264).

Almost surely, 2^6660788437 is an apocalyptic number.

It is an amenable number.

6660788437 is a deficient number, since it is larger than the sum of its proper divisors (4604619).

6660788437 is a wasteful number, since it uses less digits than its factorization.

6660788437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4604618.

The product of its (nonzero) digits is 8128512, while the sum is 55.

The square root of 6660788437 is about 81613.6534962135. The cubic root of 6660788437 is about 1881.5187325113.

The spelling of 6660788437 in words is "six billion, six hundred sixty million, seven hundred eighty-eight thousand, four hundred thirty-seven".