1205852421457 has 2 divisors, whose sum is σ = 1205852421458. Its totient is φ = 1205852421456.

The previous prime is 1205852421437. The next prime is 1205852421481. The reversal of 1205852421457 is 7541242585021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 851626282896 + 354226138561 = 922836^2 + 595169^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205852421457 - 2⁷ = 1205852421329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1205852421437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602926210728 + 602926210729.

It is an arithmetic number, because the mean of its divisors is an integer number (602926210729).

Almost surely, 2^{1205852421457} is an apocalyptic number.

It is an amenable number.

1205852421457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205852421457 is an equidigital number, since it uses as much as digits as its factorization.

1205852421457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896000, while the sum is 46.

The spelling of 1205852421457 in words is "one trillion, two hundred five billion, eight hundred fifty-two million, four hundred twenty-one thousand, four hundred fifty-seven".