261655554271576 has 128 divisors (see below), whose sum is σ = 510472917711360. Its totient is φ = 125602106572800.

The previous prime is 261655554271567. The next prime is 261655554271649. The reversal of 261655554271576 is 675172455556162.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 14458495360 + ... + 14458513456.

It is an arithmetic number, because the mean of its divisors is an integer number (3988069669620).

Almost surely, 2^{261655554271576} is an apocalyptic number.

It is an amenable number.

261655554271576 is a deficient number, since it is larger than the sum of its proper divisors (248817363439784).

261655554271576 is a wasteful number, since it uses less digits than its factorization.

261655554271576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19325 (or 19321 counting only the distinct ones).

The product of its digits is 529200000, while the sum is 67.

The spelling of 261655554271576 in words is "two hundred sixty-one trillion, six hundred fifty-five billion, five hundred fifty-four million, two hundred seventy-one thousand, five hundred seventy-six".