65555661615 has 8 divisors (see below), whose sum is σ = 104889058608. Its totient is φ = 34963019520.

The previous prime is 65555661607. The next prime is 65555661629. The reversal of 65555661615 is 51616655556.

65555661615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 65555661615 - 2³ = 65555661607 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2185188706 + ... + 2185188735.

It is an arithmetic number, because the mean of its divisors is an integer number (13111132326).

Almost surely, 2^65555661615 is an apocalyptic number.

65555661615 is a deficient number, since it is larger than the sum of its proper divisors (39333396993).

65555661615 is a wasteful number, since it uses less digits than its factorization.

65555661615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370377449.

The product of its digits is 4050000, while the sum is 51.

The spelling of 65555661615 in words is "sixty-five billion, five hundred fifty-five million, six hundred sixty-one thousand, six hundred fifteen".