66551111065 has 8 divisors (see below), whose sum is σ = 79914195648. Its totient is φ = 53205647280.

The previous prime is 66551111059. The next prime is 66551111069. The reversal of 66551111065 is 56011115566.

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

It is not a de Polignac number, because 66551111065 - 2³ = 66551111057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66551111069) 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, 4396887 + ... + 4411996.

It is an arithmetic number, because the mean of its divisors is an integer number (9989274456).

Almost surely, 2^66551111065 is an apocalyptic number.

It is an amenable number.

66551111065 is a deficient number, since it is larger than the sum of its proper divisors (13363084583).

66551111065 is a wasteful number, since it uses less digits than its factorization.

66551111065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8810399.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 66551111065 in words is "sixty-six billion, five hundred fifty-one million, one hundred eleven thousand, sixty-five".