66165110651 has 4 divisors (see below), whose sum is σ = 66547568112. Its totient is φ = 65782653192.

The previous prime is 66165110633. The next prime is 66165110653. The reversal of 66165110651 is 15601156166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15601156166 = 2 ⋅7800578083.

It is a cyclic number.

It is not a de Polignac number, because 66165110651 - 2¹⁰ = 66165109627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66165110653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191228471 + ... + 191228816.

It is an arithmetic number, because the mean of its divisors is an integer number (16636892028).

Almost surely, 2^66165110651 is an apocalyptic number.

66165110651 is a deficient number, since it is larger than the sum of its proper divisors (382457461).

66165110651 is a wasteful number, since it uses less digits than its factorization.

66165110651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382457460.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 66165110651 in words is "sixty-six billion, one hundred sixty-five million, one hundred ten thousand, six hundred fifty-one".