1257649652573 has 4 divisors (see below), whose sum is σ = 1259687983260. Its totient is φ = 1255611321888.

The previous prime is 1257649652569. The next prime is 1257649652647. The reversal of 1257649652573 is 3752569467521.

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 53193887044 + 1204455765529 = 230638^2 + 1097477^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257649652573 - 2² = 1257649652569 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 (1257649652533) 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, 1019164418 + ... + 1019165651.

It is an arithmetic number, because the mean of its divisors is an integer number (314921995815).

Almost surely, 2^{1257649652573} is an apocalyptic number.

It is an amenable number.

1257649652573 is a deficient number, since it is larger than the sum of its proper divisors (2038330687).

1257649652573 is an equidigital number, since it uses as much as digits as its factorization.

1257649652573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038330686.

The product of its digits is 95256000, while the sum is 62.

The spelling of 1257649652573 in words is "one trillion, two hundred fifty-seven billion, six hundred forty-nine million, six hundred fifty-two thousand, five hundred seventy-three".