650520865 has 16 divisors (see below), whose sum is σ = 806865552. Its totient is φ = 503103744.

The previous prime is 650520863. The next prime is 650520869. The reversal of 650520865 is 568025056.

It can be written as a sum of positive squares in 8 ways, for example, as 76055841 + 574465024 = 8721^2 + 23968^2 .

It is a cyclic number.

It is not a de Polignac number, because 650520865 - 2¹ = 650520863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650520863) 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, 17847 + ... + 40243.

It is an arithmetic number, because the mean of its divisors is an integer number (50429097).

Almost surely, 2^650520865 is an apocalyptic number.

It is an amenable number.

650520865 is a deficient number, since it is larger than the sum of its proper divisors (156344687).

650520865 is a wasteful number, since it uses less digits than its factorization.

650520865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22596.

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 650520865 is about 25505.3105254572. The cubic root of 650520865 is about 866.4704249136.

The spelling of 650520865 in words is "six hundred fifty million, five hundred twenty thousand, eight hundred sixty-five".