261203116575528 has 24 divisors (see below), whose sum is σ = 707425107392250. Its totient is φ = 87067705525152.

The previous prime is 261203116575431. The next prime is 261203116575529. The reversal of 261203116575528 is 825575611302162.

261203116575528 is a `hidden beast` number, since 2 + 6 + 1 + 2 + 0 + 3 + 1 + 16 + 575 + 52 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 178313344973604 + 82889771601924 = 13353402^2 + 9104382^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (261203116575529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1813910531703 + ... + 1813910531846.

Almost surely, 2^{261203116575528} is an apocalyptic number.

It is an amenable number.

261203116575528 is an abundant number, since it is smaller than the sum of its proper divisors (446221990816722).

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

261203116575528 is a wasteful number, since it uses less digits than its factorization.

261203116575528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627821063561 (or 3627821063554 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 54.

The spelling of 261203116575528 in words is "two hundred sixty-one trillion, two hundred three billion, one hundred sixteen million, five hundred seventy-five thousand, five hundred twenty-eight".