1251985602946 has 36 divisors (see below), whose sum is σ = 2160207878022. Its totient is φ = 543848907264.

The previous prime is 1251985602913. The next prime is 1251985602949. The reversal of 1251985602946 is 6492065891521.

It can be written as a sum of positive squares in 9 ways, for example, as 167448732025 + 1084536870921 = 409205^2 + 1041411^2 .

It is not an unprimeable number, because it can be changed into a prime (1251985602949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6310795 + ... + 6506158.

Almost surely, 2^{1251985602946} is an apocalyptic number.

1251985602946 is a deficient number, since it is larger than the sum of its proper divisors (908222275076).

1251985602946 is a wasteful number, since it uses less digits than its factorization.

1251985602946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12817015 (or 12816985 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 58.

The spelling of 1251985602946 in words is "one trillion, two hundred fifty-one billion, nine hundred eighty-five million, six hundred two thousand, nine hundred forty-six".