66151808671 has 32 divisors (see below), whose sum is σ = 76007151360. Its totient is φ = 57033414144.

The previous prime is 66151808659. The next prime is 66151808699. The reversal of 66151808671 is 17680815166.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66151808671 - 2¹³ = 66151800479 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 (66151898671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41893960 + ... + 41895538.

It is an arithmetic number, because the mean of its divisors is an integer number (2375223480).

Almost surely, 2^66151808671 is an apocalyptic number.

66151808671 is a deficient number, since it is larger than the sum of its proper divisors (9855342689).

66151808671 is a wasteful number, since it uses less digits than its factorization.

66151808671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2935.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 66151808671 in words is "sixty-six billion, one hundred fifty-one million, eight hundred eight thousand, six hundred seventy-one".