261743225039 has 4 divisors (see below), whose sum is σ = 261744258456. Its totient is φ = 261742191624.

The previous prime is 261743225017. The next prime is 261743225111. The reversal of 261743225039 is 930522347162.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 261743225039 - 2³² = 257448257743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261743225339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149732 + ... + 738854.

It is an arithmetic number, because the mean of its divisors is an integer number (65436064614).

Almost surely, 2^261743225039 is an apocalyptic number.

261743225039 is a deficient number, since it is larger than the sum of its proper divisors (1033417).

261743225039 is an equidigital number, since it uses as much as digits as its factorization.

261743225039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033416.

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 261743225039 in words is "two hundred sixty-one billion, seven hundred forty-three million, two hundred twenty-five thousand, thirty-nine".