261440634372353 has 8 divisors (see below), whose sum is σ = 262819685842560. Its totient is φ = 260062107565680.

The previous prime is 261440634372341. The next prime is 261440634372373. The reversal of 261440634372353 is 353273436044162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261440634372353 - 2⁴⁴ = 243848448327937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261440634372295 and 261440634372304.

It is not an unprimeable number, because it can be changed into a prime (261440634372373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130166633 + ... + 132159878.

It is an arithmetic number, because the mean of its divisors is an integer number (32852460730320).

Almost surely, 2^{261440634372353} is an apocalyptic number.

It is an amenable number.

261440634372353 is a deficient number, since it is larger than the sum of its proper divisors (1379051470207).

261440634372353 is a wasteful number, since it uses less digits than its factorization.

261440634372353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262331767.

The product of its (nonzero) digits is 26127360, while the sum is 53.

The spelling of 261440634372353 in words is "two hundred sixty-one trillion, four hundred forty billion, six hundred thirty-four million, three hundred seventy-two thousand, three hundred fifty-three".