261646064667426 has 16 divisors (see below), whose sum is σ = 523328772047328. Its totient is φ = 87209247770400.

The previous prime is 261646064667373. The next prime is 261646064667431. The reversal of 261646064667426 is 624766460646162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1526686860 + ... + 1526858231.

It is an arithmetic number, because the mean of its divisors is an integer number (32708048252958).

Almost surely, 2^{261646064667426} is an apocalyptic number.

261646064667426 is an abundant number, since it is smaller than the sum of its proper divisors (261682707379902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261646064667426 is a wasteful number, since it uses less digits than its factorization.

261646064667426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3053559377.

The product of its (nonzero) digits is 501645312, while the sum is 66.

The spelling of 261646064667426 in words is "two hundred sixty-one trillion, six hundred forty-six billion, sixty-four million, six hundred sixty-seven thousand, four hundred twenty-six".