261732199247 has 4 divisors (see below), whose sum is σ = 261740094960. Its totient is φ = 261724303536.

The previous prime is 261732199237. The next prime is 261732199303. The reversal of 261732199247 is 742991237162.

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

It is a cyclic number.

It is not a de Polignac number, because 261732199247 - 2⁴ = 261732199231 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 (261732199207) 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, 3897923 + ... + 3964500.

It is an arithmetic number, because the mean of its divisors is an integer number (65435023740).

Almost surely, 2^261732199247 is an apocalyptic number.

261732199247 is a deficient number, since it is larger than the sum of its proper divisors (7895713).

261732199247 is an equidigital number, since it uses as much as digits as its factorization.

261732199247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7895712.

The product of its digits is 2286144, while the sum is 53.

The spelling of 261732199247 in words is "two hundred sixty-one billion, seven hundred thirty-two million, one hundred ninety-nine thousand, two hundred forty-seven".