645355137 has 72 divisors (see below), whose sum is σ = 1076253024. Its totient is φ = 342752256.

The previous prime is 645355127. The next prime is 645355153. The reversal of 645355137 is 731553546.

645355137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645355137 - 2¹⁰ = 645354113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645355095 and 645355104.

It is not an unprimeable number, because it can be changed into a prime (645355127) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3343713 + ... + 3343905.

Almost surely, 2^645355137 is an apocalyptic number.

It is an amenable number.

645355137 is a deficient number, since it is larger than the sum of its proper divisors (430897887).

645355137 is a wasteful number, since it uses less digits than its factorization.

645355137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 269 counting only the distinct ones).

The product of its digits is 189000, while the sum is 39.

The square root of 645355137 is about 25403.8409891103. The cubic root of 645355137 is about 864.1708057263.

The spelling of 645355137 in words is "six hundred forty-five million, three hundred fifty-five thousand, one hundred thirty-seven".