261982863351 has 24 divisors (see below), whose sum is σ = 426614279280. Its totient is φ = 158777490960.

The previous prime is 261982863349. The next prime is 261982863377. The reversal of 261982863351 is 153368289162.

261982863351 is a `hidden beast` number, since 2 + 6 + 1 + 9 + 8 + 286 + 3 + 351 = 666.

It is not a de Polignac number, because 261982863351 - 2¹ = 261982863349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261982863341) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 40092060 + ... + 40098593.

It is an arithmetic number, because the mean of its divisors is an integer number (17775594970).

Almost surely, 2^261982863351 is an apocalyptic number.

261982863351 is a deficient number, since it is larger than the sum of its proper divisors (164631415929).

261982863351 is a wasteful number, since it uses less digits than its factorization.

261982863351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80190684 (or 80190667 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 261982863351 in words is "two hundred sixty-one billion, nine hundred eighty-two million, eight hundred sixty-three thousand, three hundred fifty-one".