261446981392 has 20 divisors (see below), whose sum is σ = 506610320400. Its totient is φ = 130708834208.

The previous prime is 261446981387. The next prime is 261446981407. The reversal of 261446981392 is 293189644162.

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, 768142 + ... + 1054957.

It is an arithmetic number, because the mean of its divisors is an integer number (25330516020).

Almost surely, 2^261446981392 is an apocalyptic number.

It is an amenable number.

261446981392 is a deficient number, since it is larger than the sum of its proper divisors (245163339008).

261446981392 is a wasteful number, since it uses less digits than its factorization.

261446981392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832070 (or 1832064 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 55.

The spelling of 261446981392 in words is "two hundred sixty-one billion, four hundred forty-six million, nine hundred eighty-one thousand, three hundred ninety-two".