42165554724 has 120 divisors (see below), whose sum is σ = 117827918208. Its totient is φ = 13116090240.

The previous prime is 42165554723. The next prime is 42165554759. The reversal of 42165554724 is 42745556124.

42165554724 is a `hidden beast` number, since 4 + 21 + 6 + 5 + 554 + 72 + 4 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 42165554724.

It is not an unprimeable number, because it can be changed into a prime (42165554723) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 236529 + ... + 374535.

Almost surely, 2^42165554724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42165554724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58913959104).

42165554724 is an abundant number, since it is smaller than the sum of its proper divisors (75662363484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42165554724 is a wasteful number, since it uses less digits than its factorization.

42165554724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138087 (or 138076 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 45.

The spelling of 42165554724 in words is "forty-two billion, one hundred sixty-five million, five hundred fifty-four thousand, seven hundred twenty-four".