261150722561072 has 40 divisors (see below), whose sum is σ = 506223036214560. Its totient is φ = 130512530903040.

The previous prime is 261150722561011. The next prime is 261150722561077. The reversal of 261150722561072 is 270165227051162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261150722561077) 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, 377630429 + ... + 378321347.

It is an arithmetic number, because the mean of its divisors is an integer number (12655575905364).

Almost surely, 2^{261150722561072} is an apocalyptic number.

It is an amenable number.

261150722561072 is a deficient number, since it is larger than the sum of its proper divisors (245072313653488).

261150722561072 is a wasteful number, since it uses less digits than its factorization.

261150722561072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702261 (or 702255 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 261150722561072 in words is "two hundred sixty-one trillion, one hundred fifty billion, seven hundred twenty-two million, five hundred sixty-one thousand, seventy-two".