261258751659 has 12 divisors (see below), whose sum is σ = 360771105656. Its totient is φ = 168166551168.

The previous prime is 261258751643. The next prime is 261258751669. The reversal of 261258751659 is 956157852162.

It is not a de Polignac number, because 261258751659 - 2⁴ = 261258751643 is a prime.

It is a super-2 number, since 2×261258751659² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261258751599 and 261258751608.

It is not an unprimeable number, because it can be changed into a prime (261258751639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51772894 + ... + 51777939.

Almost surely, 2^261258751659 is an apocalyptic number.

261258751659 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

261258751659 is a deficient number, since it is larger than the sum of its proper divisors (99512353997).

261258751659 is a wasteful number, since it uses less digits than its factorization.

261258751659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103550894 (or 103550865 counting only the distinct ones).

The product of its digits is 9072000, while the sum is 57.

The spelling of 261258751659 in words is "two hundred sixty-one billion, two hundred fifty-eight million, seven hundred fifty-one thousand, six hundred fifty-nine".