261340007293 has 4 divisors (see below), whose sum is σ = 261345826368. Its totient is φ = 261334188220.

The previous prime is 261340007287. The next prime is 261340007297. The reversal of 261340007293 is 392700043162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261340007293 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 (261340007297) 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, 2841643 + ... + 2932168.

It is an arithmetic number, because the mean of its divisors is an integer number (65336456592).

Almost surely, 2^261340007293 is an apocalyptic number.

It is an amenable number.

261340007293 is a deficient number, since it is larger than the sum of its proper divisors (5819075).

261340007293 is an equidigital number, since it uses as much as digits as its factorization.

261340007293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5819074.

The product of its (nonzero) digits is 54432, while the sum is 37.

The spelling of 261340007293 in words is "two hundred sixty-one billion, three hundred forty million, seven thousand, two hundred ninety-three".