261028645343 has 4 divisors (see below), whose sum is σ = 261034180968. Its totient is φ = 261023109720.

The previous prime is 261028645337. The next prime is 261028645357. The reversal of 261028645343 is 343546820162.

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 261028645343 - 2⁴ = 261028645327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261028645294 and 261028645303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261028645363) 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, 2696468 + ... + 2791593.

It is an arithmetic number, because the mean of its divisors is an integer number (65258545242).

Almost surely, 2^261028645343 is an apocalyptic number.

261028645343 is a deficient number, since it is larger than the sum of its proper divisors (5535625).

261028645343 is an equidigital number, since it uses as much as digits as its factorization.

261028645343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5535624.

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 261028645343 in words is "two hundred sixty-one billion, twenty-eight million, six hundred forty-five thousand, three hundred forty-three".