261600777318311 has 8 divisors (see below), whose sum is σ = 267291702366480. Its totient is φ = 255937817504512.

The previous prime is 261600777318259. The next prime is 261600777318313. The reversal of 261600777318311 is 113813777006162.

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 261600777318311 - 2²² = 261600773124007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261600777318313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6991289681 + ... + 6991327098.

It is an arithmetic number, because the mean of its divisors is an integer number (33411462795810).

Almost surely, 2^{261600777318311} is an apocalyptic number.

261600777318311 is a deficient number, since it is larger than the sum of its proper divisors (5690925048169).

261600777318311 is a wasteful number, since it uses less digits than its factorization.

261600777318311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13982617185.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The spelling of 261600777318311 in words is "two hundred sixty-one trillion, six hundred billion, seven hundred seventy-seven million, three hundred eighteen thousand, three hundred eleven".