261543674460045 has 16 divisors (see below), whose sum is σ = 418568505181632. Its totient is φ = 139457084363520.

The previous prime is 261543674460041. The next prime is 261543674460049. The reversal of 261543674460045 is 540064476345162.

It is an interprime number because it is at equal distance from previous prime (261543674460041) and next prime (261543674460049).

It is not a de Polignac number, because 261543674460045 - 2² = 261543674460041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261543674460041) 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 15 ways as a sum of consecutive naturals, for example, 2054643516 + ... + 2054770805.

It is an arithmetic number, because the mean of its divisors is an integer number (26160531573852).

Almost surely, 2^{261543674460045} is an apocalyptic number.

It is an amenable number.

261543674460045 is a deficient number, since it is larger than the sum of its proper divisors (157024830721587).

261543674460045 is a wasteful number, since it uses less digits than its factorization.

261543674460045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109418572.

The product of its (nonzero) digits is 58060800, while the sum is 57.

The spelling of 261543674460045 in words is "two hundred sixty-one trillion, five hundred forty-three billion, six hundred seventy-four million, four hundred sixty thousand, forty-five".