6561060601656 has 96 divisors (see below), whose sum is σ = 18207870080400. Its totient is φ = 1968514944000.

The previous prime is 6561060601651. The next prime is 6561060601691.

6561060601656 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561060601651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10891441 + ... + 11478048.

Almost surely, 2^{6561060601656} is an apocalyptic number.

6561060601656 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6561060601656 is an abundant number, since it is smaller than the sum of its proper divisors (11646809478744).

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

6561060601656 is a wasteful number, since it uses less digits than its factorization.

6561060601656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22369621 (or 22369606 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 6561060601656 in words is "six trillion, five hundred sixty-one billion, sixty million, six hundred one thousand, six hundred fifty-six".