261430421257245 has 64 divisors (see below), whose sum is σ = 434284721031168. Its totient is φ = 134151873408000.

The previous prime is 261430421257223. The next prime is 261430421257297. The reversal of 261430421257245 is 542752124034162.

261430421257245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261430421257245 - 2⁹ = 261430421256733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261430421257194 and 261430421257203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55080255 + ... + 59638035.

It is an arithmetic number, because the mean of its divisors is an integer number (6785698766112).

Almost surely, 2^{261430421257245} is an apocalyptic number.

It is an amenable number.

261430421257245 is a deficient number, since it is larger than the sum of its proper divisors (172854299773923).

261430421257245 is a wasteful number, since it uses less digits than its factorization.

261430421257245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4558534.

The product of its (nonzero) digits is 3225600, while the sum is 48.

The spelling of 261430421257245 in words is "two hundred sixty-one trillion, four hundred thirty billion, four hundred twenty-one million, two hundred fifty-seven thousand, two hundred forty-five".