6561656510010 has 32 divisors (see below), whose sum is σ = 17997686428032. Its totient is φ = 1499807202240.

The previous prime is 6561656510009. The next prime is 6561656510033. The reversal of 6561656510010 is 100156561656.

It is a super-2 number, since 2×6561656510010² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15622991481 + ... + 15622991900.

It is an arithmetic number, because the mean of its divisors is an integer number (562427700876).

Almost surely, 2^{6561656510010} is an apocalyptic number.

6561656510010 is an abundant number, since it is smaller than the sum of its proper divisors (11436029918022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6561656510010 is a wasteful number, since it uses less digits than its factorization.

6561656510010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31245983398.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 6561656510010 in words is "six trillion, five hundred sixty-one billion, six hundred fifty-six million, five hundred ten thousand, ten".