261335386743 has 16 divisors (see below), whose sum is σ = 356961696000. Its totient is φ = 169966710720.

The previous prime is 261335386733. The next prime is 261335386747. The reversal of 261335386743 is 347683533162.

It is not a de Polignac number, because 261335386743 - 2¹⁰ = 261335385719 is a prime.

It is a super-2 number, since 2×261335386743² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261335386747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4608798 + ... + 4665156.

It is an arithmetic number, because the mean of its divisors is an integer number (22310106000).

Almost surely, 2^261335386743 is an apocalyptic number.

261335386743 is a deficient number, since it is larger than the sum of its proper divisors (95626309257).

261335386743 is a wasteful number, since it uses less digits than its factorization.

261335386743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94102.

The product of its digits is 6531840, while the sum is 51.

The spelling of 261335386743 in words is "two hundred sixty-one billion, three hundred thirty-five million, three hundred eighty-six thousand, seven hundred forty-three".