261566104 has 8 divisors (see below), whose sum is σ = 490436460. Its totient is φ = 130783048.

The previous prime is 261566089. The next prime is 261566113. The reversal of 261566104 is 401665162.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16347874 + ... + 16347889.

Almost surely, 2^261566104 is an apocalyptic number.

It is an amenable number.

261566104 is a deficient number, since it is larger than the sum of its proper divisors (228870356).

261566104 is a wasteful number, since it uses less digits than its factorization.

261566104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32695769 (or 32695765 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 261566104 is about 16173.0054102507. The cubic root of 261566104 is about 639.5293610207.

The spelling of 261566104 in words is "two hundred sixty-one million, five hundred sixty-six thousand, one hundred four".