260591520421 has 4 divisors (see below), whose sum is σ = 260597648844. Its totient is φ = 260585392000.

The previous prime is 260591520389. The next prime is 260591520451. The reversal of 260591520421 is 124025195062.

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

It can be written as a sum of positive squares in 2 ways, for example, as 89287416100 + 171304104321 = 298810^2 + 413889^2 .

It is a cyclic number.

It is not a de Polignac number, because 260591520421 - 2⁵ = 260591520389 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 (260591520451) 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, 2999980 + ... + 3085621.

It is an arithmetic number, because the mean of its divisors is an integer number (65149412211).

Almost surely, 2^260591520421 is an apocalyptic number.

It is an amenable number.

260591520421 is a deficient number, since it is larger than the sum of its proper divisors (6128423).

260591520421 is an equidigital number, since it uses as much as digits as its factorization.

260591520421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6128422.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 260591520421 in words is "two hundred sixty billion, five hundred ninety-one million, five hundred twenty thousand, four hundred twenty-one".