66220556633 has 16 divisors (see below), whose sum is σ = 82798654464. Its totient is φ = 51451708560.

The previous prime is 66220556617. The next prime is 66220556653. The reversal of 66220556633 is 33665502266.

66220556633 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66220556633 - 2⁴ = 66220556617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66220556653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1212485 + ... + 1265922.

It is an arithmetic number, because the mean of its divisors is an integer number (5174915904).

Almost surely, 2^66220556633 is an apocalyptic number.

It is an amenable number.

66220556633 is a deficient number, since it is larger than the sum of its proper divisors (16578097831).

66220556633 is a wasteful number, since it uses less digits than its factorization.

66220556633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478772.

The product of its (nonzero) digits is 1166400, while the sum is 44.

The spelling of 66220556633 in words is "sixty-six billion, two hundred twenty million, five hundred fifty-six thousand, six hundred thirty-three".