261301011456 has 88 divisors (see below), whose sum is σ = 706272381504. Its totient is φ = 85873500160.

The previous prime is 261301011437. The next prime is 261301011509. The reversal of 261301011456 is 654110103162.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380895 + ... + 817118.

Almost surely, 2^261301011456 is an apocalyptic number.

It is an amenable number.

261301011456 is an abundant number, since it is smaller than the sum of its proper divisors (444971370048).

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

261301011456 is a wasteful number, since it uses less digits than its factorization.

261301011456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198107 (or 1198089 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 261301011456 in words is "two hundred sixty-one billion, three hundred one million, eleven thousand, four hundred fifty-six".