66513082861 has 8 divisors (see below), whose sum is σ = 66781440000. Its totient is φ = 66245207952.

The previous prime is 66513082859. The next prime is 66513082873. The reversal of 66513082861 is 16828031566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66513082861 - 2¹ = 66513082859 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 (66513082061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157140 + ... + 397138.

It is an arithmetic number, because the mean of its divisors is an integer number (8347680000).

Almost surely, 2^66513082861 is an apocalyptic number.

It is an amenable number.

66513082861 is a deficient number, since it is larger than the sum of its proper divisors (268357139).

66513082861 is a wasteful number, since it uses less digits than its factorization.

66513082861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241115.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 66513082861 in words is "sixty-six billion, five hundred thirteen million, eighty-two thousand, eight hundred sixty-one".