261064471578623 has 2 divisors, whose sum is σ = 261064471578624. Its totient is φ = 261064471578622.

The previous prime is 261064471578577. The next prime is 261064471578629. The reversal of 261064471578623 is 326875174460162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261064471578623 is a prime.

It is a super-3 number, since 3×261064471578623³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261064471578629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130532235789311 + 130532235789312.

It is an arithmetic number, because the mean of its divisors is an integer number (130532235789312).

Almost surely, 2^{261064471578623} is an apocalyptic number.

261064471578623 is a deficient number, since it is larger than the sum of its proper divisors (1).

261064471578623 is an equidigital number, since it uses as much as digits as its factorization.

261064471578623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81285120, while the sum is 62.

The spelling of 261064471578623 in words is "two hundred sixty-one trillion, sixty-four billion, four hundred seventy-one million, five hundred seventy-eight thousand, six hundred twenty-three".