260891928457 has 4 divisors (see below), whose sum is σ = 262257854976. Its totient is φ = 259526001940.

The previous prime is 260891928443. The next prime is 260891928469. The reversal of 260891928457 is 754829198062.

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 not a de Polignac number, because 260891928457 - 2²⁷ = 260757710729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 260891928395 and 260891928404.

It is not an unprimeable number, because it can be changed into a prime (260891988457) 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, 682962973 + ... + 682963354.

It is an arithmetic number, because the mean of its divisors is an integer number (65564463744).

Almost surely, 2^260891928457 is an apocalyptic number.

It is an amenable number.

260891928457 is a deficient number, since it is larger than the sum of its proper divisors (1365926519).

260891928457 is a wasteful number, since it uses less digits than its factorization.

260891928457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365926518.

The product of its (nonzero) digits is 17418240, while the sum is 61.

It can be divided in two parts, 2608919 and 28457, that added together give a square (2637376 = 1624²).

The spelling of 260891928457 in words is "two hundred sixty billion, eight hundred ninety-one million, nine hundred twenty-eight thousand, four hundred fifty-seven".