66110250305561 has 32 divisors (see below), whose sum is σ = 82541352222720. Its totient is φ = 51440657083200.

The previous prime is 66110250305513. The next prime is 66110250305581. The reversal of 66110250305561 is 16550305201166.

It is not a de Polignac number, because 66110250305561 - 2¹⁰ = 66110250304537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66110250305581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196842800 + ... + 197178366.

It is an arithmetic number, because the mean of its divisors is an integer number (2579417256960).

Almost surely, 2^{66110250305561} is an apocalyptic number.

It is an amenable number.

66110250305561 is a deficient number, since it is larger than the sum of its proper divisors (16431101917159).

66110250305561 is a wasteful number, since it uses less digits than its factorization.

66110250305561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339245.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 66110250305561 in words is "sixty-six trillion, one hundred ten billion, two hundred fifty million, three hundred five thousand, five hundred sixty-one".