261535909126888 has 32 divisors (see below), whose sum is σ = 534989805552000. Its totient is φ = 118873293932160.

The previous prime is 261535909126879. The next prime is 261535909126897. The reversal of 261535909126888 is 888621909535162.

It is an interprime number because it is at equal distance from previous prime (261535909126879) and next prime (261535909126897).

It is a self number, because there is not a number n which added to its sum of digits gives 261535909126888.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81730773 + ... + 84870436.

It is an arithmetic number, because the mean of its divisors is an integer number (16718431423500).

Almost surely, 2^{261535909126888} is an apocalyptic number.

It is an amenable number.

261535909126888 is an abundant number, since it is smaller than the sum of its proper divisors (273453896425112).

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

261535909126888 is a wasteful number, since it uses less digits than its factorization.

261535909126888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166619065 (or 166619061 counting only the distinct ones).

The product of its (nonzero) digits is 447897600, while the sum is 73.

The spelling of 261535909126888 in words is "two hundred sixty-one trillion, five hundred thirty-five billion, nine hundred nine million, one hundred twenty-six thousand, eight hundred eighty-eight".