261511005082747 has 24 divisors (see below), whose sum is σ = 314096190830592. Its totient is φ = 216868799725200.

The previous prime is 261511005082729. The next prime is 261511005082777. The reversal of 261511005082747 is 747280500115162.

It is not a de Polignac number, because 261511005082747 - 2⁷ = 261511005082619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

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 261511005082747.

It is not an unprimeable number, because it can be changed into a prime (261511005082777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14694333 + ... + 27183550.

It is an arithmetic number, because the mean of its divisors is an integer number (13087341284608).

Almost surely, 2^{261511005082747} is an apocalyptic number.

261511005082747 is a deficient number, since it is larger than the sum of its proper divisors (52585185747845).

261511005082747 is a wasteful number, since it uses less digits than its factorization.

261511005082747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41882039 (or 41882032 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 49.

The spelling of 261511005082747 in words is "two hundred sixty-one trillion, five hundred eleven billion, five million, eighty-two thousand, seven hundred forty-seven".