7998730378997 has 4 divisors (see below), whose sum is σ = 8000772438156. Its totient is φ = 7996688319840.

The previous prime is 7998730378981. The next prime is 7998730379023.

7998730378997 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4138758947236 + 3859971431761 = 2034394^2 + 1964681^2 .

It is a cyclic number.

It is not a de Polignac number, because 7998730378997 - 2⁴ = 7998730378981 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 (7998730378957) 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, 1021023704 + ... + 1021031537.

It is an arithmetic number, because the mean of its divisors is an integer number (2000193109539).

Almost surely, 2^{7998730378997} is an apocalyptic number.

It is an amenable number.

7998730378997 is a deficient number, since it is larger than the sum of its proper divisors (2042059159).

7998730378997 is a wasteful number, since it uses less digits than its factorization.

7998730378997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042059158.

The product of its (nonzero) digits is 9073705536, while the sum is 86.

The spelling of 7998730378997 in words is "seven trillion, nine hundred ninety-eight billion, seven hundred thirty million, three hundred seventy-eight thousand, nine hundred ninety-seven".