7998782878997 has 8 divisors (see below), whose sum is σ = 8470426340376. Its totient is φ = 7527264620032.

The previous prime is 7998782878979. The next prime is 7998782879083.

7998782878997 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 4053260119441 + 3945522759556 = 2013271^2 + 1986334^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7998782878997 - 2¹⁰ = 7998782877973 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 (7998782878937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31169048 + ... + 31424625.

It is an arithmetic number, because the mean of its divisors is an integer number (1058803292547).

Almost surely, 2^{7998782878997} is an apocalyptic number.

It is an amenable number.

7998782878997 is a deficient number, since it is larger than the sum of its proper divisors (471643461379).

7998782878997 is a wasteful number, since it uses less digits than its factorization.

7998782878997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62601207.

The product of its digits is 129048256512, while the sum is 98.

The spelling of 7998782878997 in words is "seven trillion, nine hundred ninety-eight billion, seven hundred eighty-two million, eight hundred seventy-eight thousand, nine hundred ninety-seven".