66000123653 has 4 divisors (see below), whose sum is σ = 66027365088. Its totient is φ = 65972882220.

The previous prime is 66000123649. The next prime is 66000123677. The reversal of 66000123653 is 35632100066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66000123653 - 2² = 66000123649 is a prime.

It is a super-2 number, since 2×66000123653² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66000123613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13617083 + ... + 13621928.

It is an arithmetic number, because the mean of its divisors is an integer number (16506841272).

Almost surely, 2^66000123653 is an apocalyptic number.

It is an amenable number.

66000123653 is a deficient number, since it is larger than the sum of its proper divisors (27241435).

66000123653 is a wasteful number, since it uses less digits than its factorization.

66000123653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27241434.

The product of its (nonzero) digits is 19440, while the sum is 32.

The spelling of 66000123653 in words is "sixty-six billion, one hundred twenty-three thousand, six hundred fifty-three".