261133775156 has 24 divisors (see below), whose sum is σ = 467769951264. Its totient is φ = 127487273760.

The previous prime is 261133775153. The next prime is 261133775179. The reversal of 261133775156 is 651577331162.

It is a self number, because there is not a number n which added to its sum of digits gives 261133775156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261133775153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255506 + ... + 766518.

It is an arithmetic number, because the mean of its divisors is an integer number (19490414636).

Almost surely, 2^261133775156 is an apocalyptic number.

It is a pronic number, being equal to 511012×511013.

It is an amenable number.

261133775156 is a deficient number, since it is larger than the sum of its proper divisors (206636176108).

261133775156 is a wasteful number, since it uses less digits than its factorization.

261133775156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514031 (or 514029 counting only the distinct ones).

The product of its digits is 793800, while the sum is 47.

The spelling of 261133775156 in words is "two hundred sixty-one billion, one hundred thirty-three million, seven hundred seventy-five thousand, one hundred fifty-six".