80042743048921 has 9 divisors (see below), whose sum is σ = 81154901380221. Its totient is φ = 78945622957152.

The previous prime is 80042743048823. The next prime is 80042743048969. The reversal of 80042743048921 is 12984034724008.

The square root of 80042743048921 is 8946661.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 2851407109321 + 77191335939600 = 1688611^2 + 8785860^2 .

It is not a de Polignac number, because 80042743048921 - 2⁹ = 80042743048409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80042743048981) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 653044975 + ... + 653167531.

It is an arithmetic number, because the mean of its divisors is an integer number (9017211264469).

Almost surely, 2^{80042743048921} is an apocalyptic number.

80042743048921 is the 8946661-st square number.

80042743048921 is the 4473331-st centered octagonal number.

It is an amenable number.

80042743048921 is a deficient number, since it is larger than the sum of its proper divisors (1112158331300).

80042743048921 is an frugal number, since it uses more digits than its factorization.

80042743048921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245260 (or 122630 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 52.

The spelling of 80042743048921 in words is "eighty trillion, forty-two billion, seven hundred forty-three million, forty-eight thousand, nine hundred twenty-one".