66580805613 has 64 divisors (see below), whose sum is σ = 110339686400. Its totient is φ = 34849932480.

The previous prime is 66580805591. The next prime is 66580805633. The reversal of 66580805613 is 31650808566.

It is not a de Polignac number, because 66580805613 - 2¹² = 66580801517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66580805633) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22052418 + ... + 22055436.

It is an arithmetic number, because the mean of its divisors is an integer number (1724057600).

Almost surely, 2^66580805613 is an apocalyptic number.

It is an amenable number.

66580805613 is a deficient number, since it is larger than the sum of its proper divisors (43758880787).

66580805613 is a wasteful number, since it uses less digits than its factorization.

66580805613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4862.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 66580805613 in words is "sixty-six billion, five hundred eighty million, eight hundred five thousand, six hundred thirteen".