261533524721137 has 8 divisors (see below), whose sum is σ = 265967032474080. Its totient is φ = 257100041506560.

The previous prime is 261533524721113. The next prime is 261533524721239. The reversal of 261533524721137 is 731127425335162.

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 261533524721137 - 2¹⁹ = 261533524196849 is a prime.

It is a super-2 number, since 2×261533524721137² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261533524722137) 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 7 ways as a sum of consecutive naturals, for example, 16035793 + ... + 27932305.

It is an arithmetic number, because the mean of its divisors is an integer number (33245879059260).

Almost surely, 2^{261533524721137} is an apocalyptic number.

It is an amenable number.

261533524721137 is a deficient number, since it is larger than the sum of its proper divisors (4433507752943).

261533524721137 is a wasteful number, since it uses less digits than its factorization.

261533524721137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12269183.

The product of its digits is 6350400, while the sum is 52.

The spelling of 261533524721137 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, five hundred twenty-four million, seven hundred twenty-one thousand, one hundred thirty-seven".