66651565611 has 16 divisors (see below), whose sum is σ = 92738580480. Its totient is φ = 42499712640.

The previous prime is 66651565571. The next prime is 66651565619. The reversal of 66651565611 is 11656515666.

It is not a de Polignac number, because 66651565611 - 2⁷ = 66651565483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66651565619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2126131 + ... + 2157251.

It is an arithmetic number, because the mean of its divisors is an integer number (5796161280).

Almost surely, 2^66651565611 is an apocalyptic number.

66651565611 is a deficient number, since it is larger than the sum of its proper divisors (26087014869).

66651565611 is a wasteful number, since it uses less digits than its factorization.

66651565611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62186.

The product of its digits is 972000, while the sum is 48.

The spelling of 66651565611 in words is "sixty-six billion, six hundred fifty-one million, five hundred sixty-five thousand, six hundred eleven".