11581272537 has 16 divisors (see below), whose sum is σ = 15684744000. Its totient is φ = 7599750912.

The previous prime is 11581272463. The next prime is 11581272553. The reversal of 11581272537 is 73527218511.

It is not a de Polignac number, because 11581272537 - 2²⁶ = 11514163673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11581272587) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56293 + ... + 162269.

It is an arithmetic number, because the mean of its divisors is an integer number (980296500).

Almost surely, 2^11581272537 is an apocalyptic number.

It is an amenable number.

11581272537 is a deficient number, since it is larger than the sum of its proper divisors (4103471463).

11581272537 is a wasteful number, since it uses less digits than its factorization.

11581272537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106552.

The product of its digits is 117600, while the sum is 42.

The spelling of 11581272537 in words is "eleven billion, five hundred eighty-one million, two hundred seventy-two thousand, five hundred thirty-seven".