656960261 has 8 divisors (see below), whose sum is σ = 673575000. Its totient is φ = 640373760.

The previous prime is 656960243. The next prime is 656960263. The reversal of 656960261 is 162069656.

It can be written as a sum of positive squares in 4 ways, for example, as 30459361 + 626500900 = 5519^2 + 25030^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656960261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656960263) 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, 44795 + ... + 57623.

It is an arithmetic number, because the mean of its divisors is an integer number (84196875).

Almost surely, 2^656960261 is an apocalyptic number.

It is an amenable number.

656960261 is a deficient number, since it is larger than the sum of its proper divisors (16614739).

656960261 is a wasteful number, since it uses less digits than its factorization.

656960261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14119.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 656960261 is about 25631.2360412057. The cubic root of 656960261 is about 869.3200575393.

The spelling of 656960261 in words is "six hundred fifty-six million, nine hundred sixty thousand, two hundred sixty-one".