645051137 has 8 divisors (see below), whose sum is σ = 649785600. Its totient is φ = 640332000.

The previous prime is 645051133. The next prime is 645051151. The reversal of 645051137 is 731150546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645051137 - 2² = 645051133 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645051133) 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 7 ways as a sum of consecutive naturals, for example, 88637 + ... + 95637.

It is an arithmetic number, because the mean of its divisors is an integer number (81223200).

Almost surely, 2^645051137 is an apocalyptic number.

It is an amenable number.

645051137 is a deficient number, since it is larger than the sum of its proper divisors (4734463).

645051137 is a wasteful number, since it uses less digits than its factorization.

645051137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7663.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 645051137 is about 25397.8569371512. The cubic root of 645051137 is about 864.0350927569.

The spelling of 645051137 in words is "six hundred forty-five million, fifty-one thousand, one hundred thirty-seven".