261561445216052 has 24 divisors (see below), whose sum is σ = 477715160876352. Its totient is φ = 125073333000000.

The previous prime is 261561445216039. The next prime is 261561445216091. The reversal of 261561445216052 is 250612544165162.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241174574 + ... + 242256677.

It is an arithmetic number, because the mean of its divisors is an integer number (19904798369848).

Almost surely, 2^{261561445216052} is an apocalyptic number.

It is an amenable number.

261561445216052 is a deficient number, since it is larger than the sum of its proper divisors (216153715660300).

261561445216052 is a wasteful number, since it uses less digits than its factorization.

261561445216052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483437159 (or 483437157 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 50.

The spelling of 261561445216052 in words is "two hundred sixty-one trillion, five hundred sixty-one billion, four hundred forty-five million, two hundred sixteen thousand, fifty-two".