6665287491798 has 16 divisors (see below), whose sum is σ = 14356003828656. Its totient is φ = 2050857689760.

The previous prime is 6665287491769. The next prime is 6665287491833. The reversal of 6665287491798 is 8971947825666.

It is a super-3 number, since 3×6665287491798³ (a number of 39 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (78), and also a Moran number because the ratio is a prime number: 85452403741 = 6665287491798 / (6 + 6 + 6 + 5 + 2 + 8 + 7 + 4 + 9 + 1 + 7 + 9 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42726201793 + ... + 42726201948.

It is an arithmetic number, because the mean of its divisors is an integer number (897250239291).

Almost surely, 2^{6665287491798} is an apocalyptic number.

6665287491798 is an abundant number, since it is smaller than the sum of its proper divisors (7690716336858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6665287491798 is a wasteful number, since it uses less digits than its factorization.

6665287491798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85452403759.

The product of its digits is 2194698240, while the sum is 78.

The spelling of 6665287491798 in words is "six trillion, six hundred sixty-five billion, two hundred eighty-seven million, four hundred ninety-one thousand, seven hundred ninety-eight".