It is a congruent number.
Almost surely, 26497193972661 is an apocalyptic number.
6497193972661 is a gapful number since it is divisible by the number (61) formed by its first and last digit.
It is an amenable number.
6497193972661 is an equidigital number, since it uses as much as digits as its factorization.
6497193972661 is an odious number, because the sum of its binary digits is odd.
The spelling of 6497193972661 in words is "six trillion, four hundred ninety-seven billion, one hundred ninety-three million, nine hundred seventy-two thousand, six hundred sixty-one".