6997513147997 has 4 divisors (see below), whose sum is σ = 7004949400956. Its totient is φ = 6990076895040.

The previous prime is 6997513147993. The next prime is 6997513148023. The reversal of 6997513147997 is 7997413157996.

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 5027254559716 + 1970258588281 = 2242154^2 + 1403659^2 .

It is a cyclic number.

It is not a de Polignac number, because 6997513147997 - 2² = 6997513147993 is a prime.

It is a super-2 number, since 2×6997513147997² (a number of 26 digits) 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 (6997513147991) 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, 3718125068 + ... + 3718126949.

It is an arithmetic number, because the mean of its divisors is an integer number (1751237350239).

Almost surely, 2^{6997513147997} is an apocalyptic number.

It is an amenable number.

6997513147997 is a deficient number, since it is larger than the sum of its proper divisors (7436252959).

6997513147997 is an equidigital number, since it uses as much as digits as its factorization.

6997513147997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7436252958.

The product of its digits is 810152280, while the sum is 77.

Subtracting 6997513147997 from its reverse (7997413157996), we obtain a palindrome (999900009999).

The spelling of 6997513147997 in words is "six trillion, nine hundred ninety-seven billion, five hundred thirteen million, one hundred forty-seven thousand, nine hundred ninety-seven".