261366334452 has 18 divisors (see below), whose sum is σ = 660676012178. Its totient is φ = 87122111472.

The previous prime is 261366334451. The next prime is 261366334459. The reversal of 261366334452 is 254433663162.

261366334452 is a `hidden beast` number, since 2 + 6 + 1 + 3 + 6 + 633 + 4 + 4 + 5 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 204481222416 + 56885112036 = 452196^2 + 238506^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 261366334398 and 261366334407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261366334451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3630087943 + ... + 3630088014.

Almost surely, 2^261366334452 is an apocalyptic number.

It is an amenable number.

261366334452 is an abundant number, since it is smaller than the sum of its proper divisors (399309677726).

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

261366334452 is a wasteful number, since it uses less digits than its factorization.

261366334452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7260175967 (or 7260175962 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 45.

The spelling of 261366334452 in words is "two hundred sixty-one billion, three hundred sixty-six million, three hundred thirty-four thousand, four hundred fifty-two".