6697145609509 has 2 divisors, whose sum is σ = 6697145609510. Its totient is φ = 6697145609508.

The previous prime is 6697145609501. The next prime is 6697145609593. The reversal of 6697145609509 is 9059065417966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6057889393284 + 639256216225 = 2461278^2 + 799535^2 .

It is a cyclic number.

It is not a de Polignac number, because 6697145609509 - 2³ = 6697145609501 is a prime.

It is a super-2 number, since 2×6697145609509² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6697145609501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3348572804754 + 3348572804755.

It is an arithmetic number, because the mean of its divisors is an integer number (3348572804755).

Almost surely, 2^{6697145609509} is an apocalyptic number.

It is an amenable number.

6697145609509 is a deficient number, since it is larger than the sum of its proper divisors (1).

6697145609509 is an equidigital number, since it uses as much as digits as its factorization.

6697145609509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110224800, while the sum is 67.

The spelling of 6697145609509 in words is "six trillion, six hundred ninety-seven billion, one hundred forty-five million, six hundred nine thousand, five hundred nine".