659997261 has 32 divisors (see below), whose sum is σ = 1219046400. Its totient is φ = 342854640.

The previous prime is 659997251. The next prime is 659997277. The reversal of 659997261 is 162799956.

659997261 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 659997261 - 2⁵ = 659997229 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 659997198 and 659997207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659997251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156651 + ... + 160808.

It is an arithmetic number, because the mean of its divisors is an integer number (38095200).

Almost surely, 2^659997261 is an apocalyptic number.

It is an amenable number.

659997261 is a deficient number, since it is larger than the sum of its proper divisors (559049139).

659997261 is a wasteful number, since it uses less digits than its factorization.

659997261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317486 (or 317480 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 54.

The square root of 659997261 is about 25690.4118495597. The cubic root of 659997261 is about 870.6575647044.

The spelling of 659997261 in words is "six hundred fifty-nine million, nine hundred ninety-seven thousand, two hundred sixty-one".