42689906123 has 4 divisors (see below), whose sum is σ = 42782109408. Its totient is φ = 42597702840.

The previous prime is 42689906117. The next prime is 42689906137. The reversal of 42689906123 is 32160998624.

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-42689906123 is a prime.

It is a super-3 number, since 3×42689906123³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42689936123) 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, 46100948 + ... + 46101873.

It is an arithmetic number, because the mean of its divisors is an integer number (10695527352).

Almost surely, 2^42689906123 is an apocalyptic number.

42689906123 is a deficient number, since it is larger than the sum of its proper divisors (92203285).

42689906123 is an equidigital number, since it uses as much as digits as its factorization.

42689906123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92203284.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 42689906123 in words is "forty-two billion, six hundred eighty-nine million, nine hundred six thousand, one hundred twenty-three".