1678401240729 has 16 divisors (see below), whose sum is σ = 2271884701248. Its totient is φ = 1101935020032.

The previous prime is 1678401240709. The next prime is 1678401240757. The reversal of 1678401240729 is 9270421048761.

It is not a de Polignac number, because 1678401240729 - 2⁵ = 1678401240697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1678401240709) 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 15 ways as a sum of consecutive naturals, for example, 386232 + ... + 1872425.

It is an arithmetic number, because the mean of its divisors is an integer number (141992793828).

Almost surely, 2^{1678401240729} is an apocalyptic number.

It is an amenable number.

1678401240729 is a deficient number, since it is larger than the sum of its proper divisors (593483460519).

1678401240729 is a wasteful number, since it uses less digits than its factorization.

1678401240729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262424.

The product of its (nonzero) digits is 1354752, while the sum is 51.

The spelling of 1678401240729 in words is "one trillion, six hundred seventy-eight billion, four hundred one million, two hundred forty thousand, seven hundred twenty-nine".