6497170725681 has 16 divisors (see below), whose sum is σ = 9634940065920. Its totient is φ = 4327171271280.

The previous prime is 6497170725581. The next prime is 6497170725713. The reversal of 6497170725681 is 1865270717946.

6497170725681 is a `hidden beast` number, since 6 + 497 + 1 + 70 + 72 + 5 + 6 + 8 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-6497170725681 is a prime.

It is a super-2 number, since 2×6497170725681² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6497170725481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118746565 + ... + 118801266.

It is an arithmetic number, because the mean of its divisors is an integer number (602183754120).

Almost surely, 2^{6497170725681} is an apocalyptic number.

It is an amenable number.

6497170725681 is a deficient number, since it is larger than the sum of its proper divisors (3137769340239).

6497170725681 is a wasteful number, since it uses less digits than its factorization.

6497170725681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237548853 (or 237548847 counting only the distinct ones).

The product of its (nonzero) digits is 35562240, while the sum is 63.

The spelling of 6497170725681 in words is "six trillion, four hundred ninety-seven billion, one hundred seventy million, seven hundred twenty-five thousand, six hundred eighty-one".