261086306511 has 8 divisors (see below), whose sum is σ = 349371809584. Its totient is φ = 173429170560.

The previous prime is 261086306497. The next prime is 261086306513. The reversal of 261086306511 is 115603680162.

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

It is not a de Polignac number, because 261086306511 - 2⁶ = 261086306447 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 261086306511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261086306513) 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, 157090810 + ... + 157092471.

It is an arithmetic number, because the mean of its divisors is an integer number (43671476198).

Almost surely, 2^261086306511 is an apocalyptic number.

261086306511 is a deficient number, since it is larger than the sum of its proper divisors (88285503073).

261086306511 is a wasteful number, since it uses less digits than its factorization.

261086306511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314183561.

The product of its (nonzero) digits is 51840, while the sum is 39.

Adding to 261086306511 its reverse (115603680162), we get a palindrome (376689986673).

The spelling of 261086306511 in words is "two hundred sixty-one billion, eighty-six million, three hundred six thousand, five hundred eleven".