66511726644 has 48 divisors (see below), whose sum is σ = 169423208640. Its totient is φ = 20140707840.

The previous prime is 66511726601. The next prime is 66511726681. The reversal of 66511726644 is 44662711566.

66511726644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66511726593 and 66511726602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7182 + ... + 364794.

It is an arithmetic number, because the mean of its divisors is an integer number (3529650180).

Almost surely, 2^66511726644 is an apocalyptic number.

It is an amenable number.

66511726644 is an abundant number, since it is smaller than the sum of its proper divisors (102911481996).

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

66511726644 is a wasteful number, since it uses less digits than its factorization.

66511726644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359040 (or 359038 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 48.

The spelling of 66511726644 in words is "sixty-six billion, five hundred eleven million, seven hundred twenty-six thousand, six hundred forty-four".