1245646126657 has 4 divisors (see below), whose sum is σ = 1245674708100. Its totient is φ = 1245617545216.

The previous prime is 1245646126633. The next prime is 1245646126687. The reversal of 1245646126657 is 7566216465421.

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 275783572801 + 969862553856 = 525151^2 + 984816^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245646126657 - 2¹¹ = 1245646124609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1245646126598 and 1245646126607.

It is not an unprimeable number, because it can be changed into a prime (1245646126687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14225248 + ... + 14312545.

It is an arithmetic number, because the mean of its divisors is an integer number (311418677025).

Almost surely, 2^{1245646126657} is an apocalyptic number.

It is an amenable number.

1245646126657 is a deficient number, since it is larger than the sum of its proper divisors (28581443).

1245646126657 is an equidigital number, since it uses as much as digits as its factorization.

1245646126657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28581442.

The product of its digits is 14515200, while the sum is 55.

The spelling of 1245646126657 in words is "one trillion, two hundred forty-five billion, six hundred forty-six million, one hundred twenty-six thousand, six hundred fifty-seven".