7945668665497 has 8 divisors (see below), whose sum is σ = 8413360874856. Its totient is φ = 7478009782272.

The previous prime is 7945668665461. The next prime is 7945668665563.

7945668665497 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 1044323856 + 7944624341641 = 32316^2 + 2818621^2 .

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 7945668665497 - 2¹⁵ = 7945668632729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7945668665497.

It is not an unprimeable number, because it can be changed into a prime (7945668665197) 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, 7839828 + ... + 8795125.

It is an arithmetic number, because the mean of its divisors is an integer number (1051670109357).

Almost surely, 2^{7945668665497} is an apocalyptic number.

It is an amenable number.

7945668665497 is a deficient number, since it is larger than the sum of its proper divisors (467692209359).

7945668665497 is a wasteful number, since it uses less digits than its factorization.

7945668665497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16663067.

The product of its digits is 16460236800, while the sum is 82.

The spelling of 7945668665497 in words is "seven trillion, nine hundred forty-five billion, six hundred sixty-eight million, six hundred sixty-five thousand, four hundred ninety-seven".