261544465413544 has 16 divisors (see below), whose sum is σ = 490399226856000. Its totient is φ = 130771338251952.

The previous prime is 261544465413533. The next prime is 261544465413547. The reversal of 261544465413544 is 445314564445162.

It is not an unprimeable number, because it can be changed into a prime (261544465413547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110563312 + ... + 112904095.

It is an arithmetic number, because the mean of its divisors is an integer number (30649951678500).

Almost surely, 2^{261544465413544} is an apocalyptic number.

It is an amenable number.

261544465413544 is a deficient number, since it is larger than the sum of its proper divisors (228854761442456).

261544465413544 is a wasteful number, since it uses less digits than its factorization.

261544465413544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223613712 (or 223613708 counting only the distinct ones).

The product of its digits is 110592000, while the sum is 58.

The spelling of 261544465413544 in words is "two hundred sixty-one trillion, five hundred forty-four billion, four hundred sixty-five million, four hundred thirteen thousand, five hundred forty-four".