7821698727666 has 64 divisors (see below), whose sum is σ = 16227898490880. Its totient is φ = 2512091050560.

The previous prime is 7821698727593. The next prime is 7821698727677. The reversal of 7821698727666 is 6667278961287.

It is a super-2 number, since 2×7821698727666² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2607055 + ... + 4737101.

It is an arithmetic number, because the mean of its divisors is an integer number (253560913920).

Almost surely, 2^{7821698727666} is an apocalyptic number.

7821698727666 is an abundant number, since it is smaller than the sum of its proper divisors (8406199763214).

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

7821698727666 is a wasteful number, since it uses less digits than its factorization.

7821698727666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130319.

The product of its digits is 1024192512, while the sum is 75.

The spelling of 7821698727666 in words is "seven trillion, eight hundred twenty-one billion, six hundred ninety-eight million, seven hundred twenty-seven thousand, six hundred sixty-six".