1257452805049 has 4 divisors (see below), whose sum is σ = 1437088920064. Its totient is φ = 1077816690036.

The previous prime is 1257452804987. The next prime is 1257452805053. The reversal of 1257452805049 is 9405082547521.

It is a happy number.

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 1257452805049 - 2¹⁹ = 1257452280761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1257452804987 and 1257452805005.

It is not an unprimeable number, because it can be changed into a prime (1257452805149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89818057497 + ... + 89818057510.

It is an arithmetic number, because the mean of its divisors is an integer number (359272230016).

Almost surely, 2^{1257452805049} is an apocalyptic number.

It is an amenable number.

1257452805049 is a deficient number, since it is larger than the sum of its proper divisors (179636115015).

1257452805049 is an equidigital number, since it uses as much as digits as its factorization.

1257452805049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179636115014.

The product of its (nonzero) digits is 4032000, while the sum is 52.

The spelling of 1257452805049 in words is "one trillion, two hundred fifty-seven billion, four hundred fifty-two million, eight hundred five thousand, forty-nine".