261114401858 has 6 divisors (see below), whose sum is σ = 391672686771. Its totient is φ = 130556839602.

The previous prime is 261114401813. The next prime is 261114401887. The reversal of 261114401858 is 858104411162.

It can be written as a sum of positive squares in only one way, i.e., 130557200929 + 130557200929 = 361327^2 + 361327^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=361327.

It is a super-2 number, since 2×261114401858² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 541991 + ... + 903317.

Almost surely, 2^261114401858 is an apocalyptic number.

261114401858 is a deficient number, since it is larger than the sum of its proper divisors (130558284913).

261114401858 is an frugal number, since it uses more digits than its factorization.

261114401858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722656 (or 361329 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 41.

The spelling of 261114401858 in words is "two hundred sixty-one billion, one hundred fourteen million, four hundred one thousand, eight hundred fifty-eight".