261310340503662 has 16 divisors (see below), whose sum is σ = 540642083801040. Its totient is φ = 84099879702272.

The previous prime is 261310340503661. The next prime is 261310340503697. The reversal of 261310340503662 is 266305043013162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261310340503661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 750891782883 + ... + 750891783230.

It is an arithmetic number, because the mean of its divisors is an integer number (33790130237565).

Almost surely, 2^{261310340503662} is an apocalyptic number.

261310340503662 is an abundant number, since it is smaller than the sum of its proper divisors (279331743297378).

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

261310340503662 is a wasteful number, since it uses less digits than its factorization.

261310340503662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501783566147.

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 261310340503662 in words is "two hundred sixty-one trillion, three hundred ten billion, three hundred forty million, five hundred three thousand, six hundred sixty-two".