261033356061 has 48 divisors (see below), whose sum is σ = 399820599360. Its totient is φ = 163817821440.

The previous prime is 261033356057. The next prime is 261033356107. The reversal of 261033356061 is 160653330162.

261033356061 is a `hidden beast` number, since 2 + 6 + 1 + 0 + 3 + 33 + 560 + 61 = 666.

It is not a de Polignac number, because 261033356061 - 2² = 261033356057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261033356021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18687666 + ... + 18701628.

It is an arithmetic number, because the mean of its divisors is an integer number (8329595820).

Almost surely, 2^261033356061 is an apocalyptic number.

It is an amenable number.

261033356061 is a deficient number, since it is larger than the sum of its proper divisors (138787243299).

261033356061 is a wasteful number, since it uses less digits than its factorization.

261033356061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15786 (or 15783 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The spelling of 261033356061 in words is "two hundred sixty-one billion, thirty-three million, three hundred fifty-six thousand, sixty-one".