659637745 has 16 divisors (see below), whose sum is σ = 853815312. Its totient is φ = 486339840.

The previous prime is 659637731. The next prime is 659637761. The reversal of 659637745 is 547736956.

It is a happy number.

659637745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 42810849 + 616826896 = 6543^2 + 24836^2 .

It is not a de Polignac number, because 659637745 - 2¹⁵ = 659604977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 659637692 and 659637701.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34675 + ... + 50215.

It is an arithmetic number, because the mean of its divisors is an integer number (53363457).

Almost surely, 2^659637745 is an apocalyptic number.

659637745 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

659637745 is a deficient number, since it is larger than the sum of its proper divisors (194177567).

659637745 is a wasteful number, since it uses less digits than its factorization.

659637745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16212.

The product of its digits is 4762800, while the sum is 52.

The square root of 659637745 is about 25683.4138112518. The cubic root of 659637745 is about 870.4994467867.

The spelling of 659637745 in words is "six hundred fifty-nine million, six hundred thirty-seven thousand, seven hundred forty-five".