261664412 has 12 divisors (see below), whose sum is σ = 464186016. Its totient is φ = 129039840.

The previous prime is 261664313. The next prime is 261664423. The reversal of 261664412 is 214466162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447764 + ... + 448347.

It is an arithmetic number, because the mean of its divisors is an integer number (38682168).

Almost surely, 2^261664412 is an apocalyptic number.

It is an amenable number.

261664412 is a deficient number, since it is larger than the sum of its proper divisors (202521604).

261664412 is a wasteful number, since it uses less digits than its factorization.

261664412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896188 (or 896186 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 261664412 is about 16176.0443866849. The cubic root of 261664412 is about 639.6094720348.

The spelling of 261664412 in words is "two hundred sixty-one million, six hundred sixty-four thousand, four hundred twelve".