42645111993 has 24 divisors (see below), whose sum is σ = 67227971616. Its totient is φ = 25834132800.

The previous prime is 42645111989. The next prime is 42645112033. The reversal of 42645111993 is 39911154624.

42645111993 is a `hidden beast` number, since 4 + 2 + 6 + 451 + 1 + 199 + 3 = 666.

It is not a de Polignac number, because 42645111993 - 2² = 42645111989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42645111973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133638 + ... + 321168.

It is an arithmetic number, because the mean of its divisors is an integer number (2801165484).

Almost surely, 2^42645111993 is an apocalyptic number.

It is an amenable number.

42645111993 is a deficient number, since it is larger than the sum of its proper divisors (24582859623).

42645111993 is a wasteful number, since it uses less digits than its factorization.

42645111993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189845 (or 189842 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 42645111993 in words is "forty-two billion, six hundred forty-five million, one hundred eleven thousand, nine hundred ninety-three".