261543140471510 has 32 divisors (see below), whose sum is σ = 487678686768000. Its totient is φ = 100918811107840.

The previous prime is 261543140471453. The next prime is 261543140471519. The reversal of 261543140471510 is 15174041345162.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261543140471519) 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, 3583728110 + ... + 3583801089.

It is an arithmetic number, because the mean of its divisors is an integer number (15239958961500).

Almost surely, 2^{261543140471510} is an apocalyptic number.

261543140471510 is a deficient number, since it is larger than the sum of its proper divisors (226135546296490).

261543140471510 is a wasteful number, since it uses less digits than its factorization.

261543140471510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7167529336.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 261543140471510 in words is "two hundred sixty-one trillion, five hundred forty-three billion, one hundred forty million, four hundred seventy-one thousand, five hundred ten".