261654519167 has 8 divisors (see below), whose sum is σ = 266096799072. Its totient is φ = 257217170400.

The previous prime is 261654519127. The next prime is 261654519169. The reversal of 261654519167 is 761915456162.

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-261654519167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261654519169) 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, 1125683 + ... + 1338084.

It is an arithmetic number, because the mean of its divisors is an integer number (33262099884).

Almost surely, 2^261654519167 is an apocalyptic number.

261654519167 is a deficient number, since it is larger than the sum of its proper divisors (4442279905).

261654519167 is a wasteful number, since it uses less digits than its factorization.

261654519167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465569.

The product of its digits is 2721600, while the sum is 53.

The spelling of 261654519167 in words is "two hundred sixty-one billion, six hundred fifty-four million, five hundred nineteen thousand, one hundred sixty-seven".