261729696371 has 32 divisors (see below), whose sum is σ = 315175008960. Its totient is φ = 214148044800.

The previous prime is 261729696359. The next prime is 261729696373. The reversal of 261729696371 is 173696927162.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261729696371 is a prime.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261729696371.

It is not an unprimeable number, because it can be changed into a prime (261729696373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10476431 + ... + 10501383.

It is an arithmetic number, because the mean of its divisors is an integer number (9849219030).

Almost surely, 2^261729696371 is an apocalyptic number.

261729696371 is a deficient number, since it is larger than the sum of its proper divisors (53445312589).

261729696371 is a wasteful number, since it uses less digits than its factorization.

261729696371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26807.

The product of its digits is 10287648, while the sum is 59.

The spelling of 261729696371 in words is "two hundred sixty-one billion, seven hundred twenty-nine million, six hundred ninety-six thousand, three hundred seventy-one".