260621613457 has 2 divisors, whose sum is σ = 260621613458. Its totient is φ = 260621613456.

The previous prime is 260621613419. The next prime is 260621613491. The reversal of 260621613457 is 754316126062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 250396156816 + 10225456641 = 500396^2 + 101121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260621613457 is a prime.

It is not a weakly prime, because it can be changed into another prime (260621613157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130310806728 + 130310806729.

It is an arithmetic number, because the mean of its divisors is an integer number (130310806729).

Almost surely, 2^260621613457 is an apocalyptic number.

It is an amenable number.

260621613457 is a deficient number, since it is larger than the sum of its proper divisors (1).

260621613457 is an equidigital number, since it uses as much as digits as its factorization.

260621613457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 260621613457 in words is "two hundred sixty billion, six hundred twenty-one million, six hundred thirteen thousand, four hundred fifty-seven".