261533527751540 has 48 divisors (see below), whose sum is σ = 618476940716544. Its totient is φ = 92035259030400.

The previous prime is 261533527751453. The next prime is 261533527751549. The reversal of 261533527751540 is 45157725335162.

It is a super-2 number, since 2×261533527751540² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261533527751549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19174005479 + ... + 19174019118.

It is an arithmetic number, because the mean of its divisors is an integer number (12884936264928).

Almost surely, 2^{261533527751540} is an apocalyptic number.

261533527751540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261533527751540 is an abundant number, since it is smaller than the sum of its proper divisors (356943412965004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261533527751540 is a wasteful number, since it uses less digits than its factorization.

261533527751540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38348024648 (or 38348024646 counting only the distinct ones).

The product of its (nonzero) digits is 26460000, while the sum is 56.

The spelling of 261533527751540 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, five hundred twenty-seven million, seven hundred fifty-one thousand, five hundred forty".