261161464 has 16 divisors (see below), whose sum is σ = 490293720. Its totient is φ = 130416480.

The previous prime is 261161449. The next prime is 261161471. The reversal of 261161464 is 464161162.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13639 + ... + 26614.

Almost surely, 2^261161464 is an apocalyptic number.

It is an amenable number.

261161464 is a deficient number, since it is larger than the sum of its proper divisors (229132256).

261161464 is a wasteful number, since it uses less digits than its factorization.

261161464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41070 (or 41066 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 261161464 is about 16160.4908341300. The cubic root of 261161464 is about 639.1994090960.

The spelling of 261161464 in words is "two hundred sixty-one million, one hundred sixty-one thousand, four hundred sixty-four".