681387757194145 has 16 divisors (see below), whose sum is σ = 853805619198720. Its totient is φ = 521049423432384.

The previous prime is 681387757194103. The next prime is 681387757194163. The reversal of 681387757194145 is 541491757783186.

It is a cyclic number.

It is not a de Polignac number, because 681387757194145 - 2⁴¹ = 679188733938593 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2047211250 + ... + 2047544059.

It is an arithmetic number, because the mean of its divisors is an integer number (53362851199920).

Almost surely, 2^{681387757194145} is an apocalyptic number.

It is an amenable number.

681387757194145 is a deficient number, since it is larger than the sum of its proper divisors (172417862004575).

681387757194145 is a wasteful number, since it uses less digits than its factorization.

681387757194145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4094756784.

The product of its digits is 1422489600, while the sum is 76.

The spelling of 681387757194145 in words is "six hundred eighty-one trillion, three hundred eighty-seven billion, seven hundred fifty-seven million, one hundred ninety-four thousand, one hundred forty-five".