261421771036017 has 16 divisors (see below), whose sum is σ = 366909719908160. Its totient is φ = 165107599981632.

The previous prime is 261421771036003. The next prime is 261421771036037. The reversal of 261421771036017 is 710630177124162.

It is not a de Polignac number, because 261421771036017 - 2²⁸ = 261421502600561 is a prime.

It is a super-2 number, since 2×261421771036017² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261421771036037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1533838 + ... + 22917159.

It is an arithmetic number, because the mean of its divisors is an integer number (22931857494260).

Almost surely, 2^{261421771036017} is an apocalyptic number.

It is an amenable number.

261421771036017 is a deficient number, since it is larger than the sum of its proper divisors (105487948872143).

261421771036017 is a wasteful number, since it uses less digits than its factorization.

261421771036017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24638592.

The product of its (nonzero) digits is 592704, while the sum is 48.

The spelling of 261421771036017 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, seven hundred seventy-one million, thirty-six thousand, seventeen".