72128580125705 has 4 divisors (see below), whose sum is σ = 86554296150852. Its totient is φ = 57702864100560.

The previous prime is 72128580125677. The next prime is 72128580125729. The reversal of 72128580125705 is 50752108582127.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36742642988041 + 35385937137664 = 6061571^2 + 5948608^2 .

It is not a de Polignac number, because 72128580125705 - 2²⁰ = 72128579077129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7212858012566 + ... + 7212858012575.

It is an arithmetic number, because the mean of its divisors is an integer number (21638574037713).

Almost surely, 2^{72128580125705} is an apocalyptic number.

It is an amenable number.

72128580125705 is a deficient number, since it is larger than the sum of its proper divisors (14425716025147).

72128580125705 is a wasteful number, since it uses less digits than its factorization.

72128580125705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14425716025146.

The product of its (nonzero) digits is 3136000, while the sum is 53.

The spelling of 72128580125705 in words is "seventy-two trillion, one hundred twenty-eight billion, five hundred eighty million, one hundred twenty-five thousand, seven hundred five".