56661065601555 has 32 divisors (see below), whose sum is σ = 95992487230464. Its totient is φ = 28441047420416.

The previous prime is 56661065601509. The next prime is 56661065601563. The reversal of 56661065601555 is 55510656016665.

It is a cyclic number.

It is not a de Polignac number, because 56661065601555 - 2²⁹ = 56660528730643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56661065601495 and 56661065601504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10258672 + ... + 14783858.

It is an arithmetic number, because the mean of its divisors is an integer number (2999765225952).

Almost surely, 2^{56661065601555} is an apocalyptic number.

56661065601555 is a deficient number, since it is larger than the sum of its proper divisors (39331421628909).

56661065601555 is a wasteful number, since it uses less digits than its factorization.

56661065601555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4574315.

The product of its (nonzero) digits is 24300000, while the sum is 57.

The spelling of 56661065601555 in words is "fifty-six trillion, six hundred sixty-one billion, sixty-five million, six hundred one thousand, five hundred fifty-five".