1678252914721 has 4 divisors (see below), whose sum is σ = 1678516755844. Its totient is φ = 1677989073600.

The previous prime is 1678252914719. The next prime is 1678252914733. The reversal of 1678252914721 is 1274192528761.

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 1146098713600 + 532154201121 = 1070560^2 + 729489^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678252914721 - 2¹ = 1678252914719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1678252918721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131911020 + ... + 131923741.

It is an arithmetic number, because the mean of its divisors is an integer number (419629188961).

Almost surely, 2^{1678252914721} is an apocalyptic number.

It is an amenable number.

1678252914721 is a deficient number, since it is larger than the sum of its proper divisors (263841123).

1678252914721 is an equidigital number, since it uses as much as digits as its factorization.

1678252914721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263841122.

The product of its digits is 3386880, while the sum is 55.

The spelling of 1678252914721 in words is "one trillion, six hundred seventy-eight billion, two hundred fifty-two million, nine hundred fourteen thousand, seven hundred twenty-one".