261544427231404 has 24 divisors (see below), whose sum is σ = 477787056858720. Its totient is φ = 125038225027584.

The previous prime is 261544427231341. The next prime is 261544427231443. The reversal of 261544427231404 is 404132724445162.

It is a super-2 number, since 2×261544427231404² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 547943899 + ... + 548421010.

It is an arithmetic number, because the mean of its divisors is an integer number (19907794035780).

Almost surely, 2^{261544427231404} is an apocalyptic number.

It is an amenable number.

261544427231404 is a deficient number, since it is larger than the sum of its proper divisors (216242629627316).

261544427231404 is a wasteful number, since it uses less digits than its factorization.

261544427231404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096367529 (or 1096367527 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 49.

The spelling of 261544427231404 in words is "two hundred sixty-one trillion, five hundred forty-four billion, four hundred twenty-seven million, two hundred thirty-one thousand, four hundred four".