665145537 has 32 divisors (see below), whose sum is σ = 1063342080. Its totient is φ = 361784640.

The previous prime is 665145529. The next prime is 665145541. The reversal of 665145537 is 735541566.

It is not a de Polignac number, because 665145537 - 2³ = 665145529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665145737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35548 + ... + 50930.

It is an arithmetic number, because the mean of its divisors is an integer number (33229440).

Almost surely, 2^665145537 is an apocalyptic number.

It is an amenable number.

665145537 is a deficient number, since it is larger than the sum of its proper divisors (398196543).

665145537 is a wasteful number, since it uses less digits than its factorization.

665145537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15493.

The product of its digits is 378000, while the sum is 42.

The square root of 665145537 is about 25790.4156034756. The cubic root of 665145537 is about 872.9155441838.

The spelling of 665145537 in words is "six hundred sixty-five million, one hundred forty-five thousand, five hundred thirty-seven".