261701734401 has 6 divisors (see below), whose sum is σ = 378013616370. Its totient is φ = 174467822928.

The previous prime is 261701734331. The next prime is 261701734409. The reversal of 261701734401 is 104437107162.

261701734401 is a `hidden beast` number, since 2 + 617 + 0 + 1 + 7 + 34 + 4 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 157927554801 + 103774179600 = 397401^2 + 322140^2 .

It is not a de Polignac number, because 261701734401 - 2⁹ = 261701733889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261701734409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14538985236 + ... + 14538985253.

It is an arithmetic number, because the mean of its divisors is an integer number (63002269395).

Almost surely, 2^261701734401 is an apocalyptic number.

It is an amenable number.

261701734401 is a deficient number, since it is larger than the sum of its proper divisors (116311881969).

261701734401 is a wasteful number, since it uses less digits than its factorization.

261701734401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29077970495 (or 29077970492 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 261701734401 in words is "two hundred sixty-one billion, seven hundred one million, seven hundred thirty-four thousand, four hundred one".