261535117053554 has 16 divisors (see below), whose sum is σ = 393381073692600. Its totient is φ = 130408357294080.

The previous prime is 261535117053541. The next prime is 261535117053559. The reversal of 261535117053554 is 455350711535162.

It can be written as a sum of positive squares in 4 ways, for example, as 172973183813329 + 88561933240225 = 13151927^2 + 9410735^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261535117053496 and 261535117053505.

It is not an unprimeable number, because it can be changed into a prime (261535117053559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64224479 + ... + 68175170.

Almost surely, 2^{261535117053554} is an apocalyptic number.

261535117053554 is a deficient number, since it is larger than the sum of its proper divisors (131845956639046).

261535117053554 is a wasteful number, since it uses less digits than its factorization.

261535117053554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132402365.

The product of its (nonzero) digits is 9450000, while the sum is 53.

The spelling of 261535117053554 in words is "two hundred sixty-one trillion, five hundred thirty-five billion, one hundred seventeen million, fifty-three thousand, five hundred fifty-four".