66654161623 has 16 divisors (see below), whose sum is σ = 77825111040. Its totient is φ = 55901323296.

The previous prime is 66654161603. The next prime is 66654161641. The reversal of 66654161623 is 32616145666.

It is a happy number.

It is not a de Polignac number, because 66654161623 - 2¹³ = 66654153431 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 (66654161603) 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, 108613 + ... + 380926.

It is an arithmetic number, because the mean of its divisors is an integer number (4864069440).

Almost surely, 2^66654161623 is an apocalyptic number.

66654161623 is a deficient number, since it is larger than the sum of its proper divisors (11170949417).

66654161623 is a wasteful number, since it uses less digits than its factorization.

66654161623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489966.

The product of its digits is 933120, while the sum is 46.

The spelling of 66654161623 in words is "sixty-six billion, six hundred fifty-four million, one hundred sixty-one thousand, six hundred twenty-three".