42066666023 has 4 divisors (see below), whose sum is σ = 42247209888. Its totient is φ = 41886122160.

The previous prime is 42066666013. The next prime is 42066666067. The reversal of 42066666023 is 32066666024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42066666023 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 (42066666013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90271583 + ... + 90272048.

It is an arithmetic number, because the mean of its divisors is an integer number (10561802472).

Almost surely, 2^42066666023 is an apocalyptic number.

42066666023 is a deficient number, since it is larger than the sum of its proper divisors (180543865).

42066666023 is a wasteful number, since it uses less digits than its factorization.

42066666023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180543864.

The product of its (nonzero) digits is 373248, while the sum is 41.

Subtracting from 42066666023 its reverse (32066666024), we obtain a palindrome (9999999999).

The spelling of 42066666023 in words is "forty-two billion, sixty-six million, six hundred sixty-six thousand, twenty-three".