1165125537 has 6 divisors (see below), whose sum is σ = 1682959122. Its totient is φ = 776750352.

The previous prime is 1165125529. The next prime is 1165125601. The reversal of 1165125537 is 7355215611.

It is a happy number.

1165125537 is a `hidden beast` number, since 116 + 5 + 1 + 2 + 5 + 537 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1147786641 + 17338896 = 33879^2 + 4164^2 .

It is not a de Polignac number, because 1165125537 - 2³ = 1165125529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1165124537) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64729188 + ... + 64729205.

It is an arithmetic number, because the mean of its divisors is an integer number (280493187).

Almost surely, 2^1165125537 is an apocalyptic number.

It is an amenable number.

1165125537 is a deficient number, since it is larger than the sum of its proper divisors (517833585).

1165125537 is a wasteful number, since it uses less digits than its factorization.

1165125537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129458399 (or 129458396 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 1165125537 is about 34133.9352697576. The cubic root of 1165125537 is about 1052.2628558686.

The spelling of 1165125537 in words is "one billion, one hundred sixty-five million, one hundred twenty-five thousand, five hundred thirty-seven".