261646246657255 has 8 divisors (see below), whose sum is σ = 313975847137392. Its totient is φ = 209316763226688.

The previous prime is 261646246657253. The next prime is 261646246657303. The reversal of 261646246657255 is 552756642646162.

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

It is a cyclic number.

It is not a de Polignac number, because 261646246657255 - 2¹ = 261646246657253 is a prime.

It is a super-2 number, since 2×261646246657255² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261646246657253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24267109 + ... + 33349438.

It is an arithmetic number, because the mean of its divisors is an integer number (39246980892174).

Almost surely, 2^{261646246657255} is an apocalyptic number.

261646246657255 is a deficient number, since it is larger than the sum of its proper divisors (52329600480137).

261646246657255 is an equidigital number, since it uses as much as digits as its factorization.

261646246657255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58524785.

The product of its digits is 870912000, while the sum is 67.

The spelling of 261646246657255 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred forty-six million, six hundred fifty-seven thousand, two hundred fifty-five".