6415125656661 has 20 divisors (see below), whose sum is σ = 9592999184032. Its totient is φ = 4272327686088.

The previous prime is 6415125656659. The next prime is 6415125656813. The reversal of 6415125656661 is 1666565215146.

It is not a de Polignac number, because 6415125656661 - 2¹ = 6415125656659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6415125656598 and 6415125656607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6415125656161) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 40872595 + ... + 41029248.

Almost surely, 2^{6415125656661} is an apocalyptic number.

It is an amenable number.

6415125656661 is a deficient number, since it is larger than the sum of its proper divisors (3177873527371).

6415125656661 is an equidigital number, since it uses as much as digits as its factorization.

6415125656661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81902822 (or 81902813 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 54.

The spelling of 6415125656661 in words is "six trillion, four hundred fifteen billion, one hundred twenty-five million, six hundred fifty-six thousand, six hundred sixty-one".