6497680971878 has 4 divisors (see below), whose sum is σ = 9746521457820. Its totient is φ = 3248840485938.

The previous prime is 6497680971877. The next prime is 6497680971953. The reversal of 6497680971878 is 8781790867946.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6497680971877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1624420242968 + ... + 1624420242971.

It is an arithmetic number, because the mean of its divisors is an integer number (2436630364455).

Almost surely, 2^{6497680971878} is an apocalyptic number.

6497680971878 is a deficient number, since it is larger than the sum of its proper divisors (3248840485942).

6497680971878 is a wasteful number, since it uses less digits than its factorization.

6497680971878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3248840485941.

The product of its (nonzero) digits is 2048385024, while the sum is 80.

The spelling of 6497680971878 in words is "six trillion, four hundred ninety-seven billion, six hundred eighty million, nine hundred seventy-one thousand, eight hundred seventy-eight".