261281302764 has 24 divisors (see below), whose sum is σ = 609799839600. Its totient is φ = 87073272384.

The previous prime is 261281302759. The next prime is 261281302771. The reversal of 261281302764 is 467203182162.

261281302764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2508739 + ... + 2610810.

It is an arithmetic number, because the mean of its divisors is an integer number (25408326650).

Almost surely, 2^261281302764 is an apocalyptic number.

It is an amenable number.

261281302764 is an abundant number, since it is smaller than the sum of its proper divisors (348518536836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261281302764 is a wasteful number, since it uses less digits than its factorization.

261281302764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5123809 (or 5123807 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 261281302764 in words is "two hundred sixty-one billion, two hundred eighty-one million, three hundred two thousand, seven hundred sixty-four".