72143438145 has 32 divisors (see below), whose sum is σ = 117689658240. Its totient is φ = 37730396160.

The previous prime is 72143438141. The next prime is 72143438183. The reversal of 72143438145 is 54183434127.

It is not a de Polignac number, because 72143438145 - 2² = 72143438141 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72143438097 and 72143438106.

It is not an unprimeable number, because it can be changed into a prime (72143438141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68851 + ... + 386040.

It is an arithmetic number, because the mean of its divisors is an integer number (3677801820).

Almost surely, 2^72143438145 is an apocalyptic number.

It is an amenable number.

72143438145 is a deficient number, since it is larger than the sum of its proper divisors (45546220095).

72143438145 is a wasteful number, since it uses less digits than its factorization.

72143438145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455105.

The product of its digits is 322560, while the sum is 42.

The spelling of 72143438145 in words is "seventy-two billion, one hundred forty-three million, four hundred thirty-eight thousand, one hundred forty-five".