1273685006645 has 16 divisors (see below), whose sum is σ = 1529468103600. Its totient is φ = 1018250870784.

The previous prime is 1273685006611. The next prime is 1273685006681. The reversal of 1273685006645 is 5466005863721.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 213777694321 + 1059907312324 = 462361^2 + 1029518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1273685006645 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 47810249 + ... + 47836881.

It is an arithmetic number, because the mean of its divisors is an integer number (95591756475).

Almost surely, 2^{1273685006645} is an apocalyptic number.

It is an amenable number.

1273685006645 is a deficient number, since it is larger than the sum of its proper divisors (255783096955).

1273685006645 is a wasteful number, since it uses less digits than its factorization.

1273685006645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32824.

The product of its (nonzero) digits is 7257600, while the sum is 53.

The spelling of 1273685006645 in words is "one trillion, two hundred seventy-three billion, six hundred eighty-five million, six thousand, six hundred forty-five".