6561510015055 has 16 divisors (see below), whose sum is σ = 8258673456000. Its totient is φ = 4998670762752.

The previous prime is 6561510015043. The next prime is 6561510015077. The reversal of 6561510015055 is 5505100151656.

It is a cyclic number.

It is not a de Polignac number, because 6561510015055 - 2³⁵ = 6527150276687 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6561510014999 and 6561510015017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377306430 + ... + 377323819.

It is an arithmetic number, because the mean of its divisors is an integer number (516167091000).

Almost surely, 2^{6561510015055} is an apocalyptic number.

6561510015055 is a deficient number, since it is larger than the sum of its proper divisors (1697163440945).

6561510015055 is a wasteful number, since it uses less digits than its factorization.

6561510015055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754630338.

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 6561510015055 in words is "six trillion, five hundred sixty-one billion, five hundred ten million, fifteen thousand, fifty-five".