261198047427 has 4 divisors (see below), whose sum is σ = 348264063240. Its totient is φ = 174132031616.

The previous prime is 261198047417. The next prime is 261198047437. The reversal of 261198047427 is 724740891162.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (261198047417) and next prime (261198047437).

It is a cyclic number.

It is not a de Polignac number, because 261198047427 - 2⁸ = 261198047171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261198047427.

It is not an unprimeable number, because it can be changed into a prime (261198047417) 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, 43533007902 + ... + 43533007907.

It is an arithmetic number, because the mean of its divisors is an integer number (87066015810).

Almost surely, 2^261198047427 is an apocalyptic number.

261198047427 is a deficient number, since it is larger than the sum of its proper divisors (87066015813).

261198047427 is an equidigital number, since it uses as much as digits as its factorization.

261198047427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87066015812.

The product of its (nonzero) digits is 1354752, while the sum is 51.

The spelling of 261198047427 in words is "two hundred sixty-one billion, one hundred ninety-eight million, forty-seven thousand, four hundred twenty-seven".