10128720537 has 12 divisors (see below), whose sum is σ = 15755787684. Its totient is φ = 6233058720.

The previous prime is 10128720533. The next prime is 10128720557. The reversal of 10128720537 is 73502782101.

10128720537 is a `hidden beast` number, since 10 + 12 + 87 + 20 + 537 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 876396816 + 9252323721 = 29604^2 + 96189^2 .

It is not a de Polignac number, because 10128720537 - 2² = 10128720533 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10128720533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43285014 + ... + 43285247.

It is an arithmetic number, because the mean of its divisors is an integer number (1312982307).

Almost surely, 2^10128720537 is an apocalyptic number.

It is an amenable number.

10128720537 is a deficient number, since it is larger than the sum of its proper divisors (5627067147).

10128720537 is a wasteful number, since it uses less digits than its factorization.

10128720537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86570280 (or 86570277 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The spelling of 10128720537 in words is "ten billion, one hundred twenty-eight million, seven hundred twenty thousand, five hundred thirty-seven".