261688254031007 has 8 divisors (see below), whose sum is σ = 263449926723456. Its totient is φ = 259930958166432.

The previous prime is 261688254030941. The next prime is 261688254031031. The reversal of 261688254031007 is 700130452886162.

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 261688254031007 - 2²⁸ = 261687985595551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261688254031007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261688254031807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1094086988 + ... + 1094326145.

It is an arithmetic number, because the mean of its divisors is an integer number (32931240840432).

Almost surely, 2^{261688254031007} is an apocalyptic number.

261688254031007 is a deficient number, since it is larger than the sum of its proper divisors (1761672692449).

261688254031007 is a wasteful number, since it uses less digits than its factorization.

261688254031007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188413937.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 261688254031007 in words is "two hundred sixty-one trillion, six hundred eighty-eight billion, two hundred fifty-four million, thirty-one thousand, seven".