916923068721 has 27 divisors (see below), whose sum is σ = 1455844465803. Its totient is φ = 555691799520.

The previous prime is 916923068687. The next prime is 916923068729. The reversal of 916923068721 is 127860329619.

The square root of 916923068721 is 957561.

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

It can be written as a sum of positive squares in only one way, i.e., 168933330225 + 747989738496 = 411015^2 + 864864^2 .

It is not a de Polignac number, because 916923068721 - 2³⁹ = 367167254833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (916923068729) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 31585005 + ... + 31614021.

Almost surely, 2^916923068721 is an apocalyptic number.

916923068721 is the 957561-st square number.

916923068721 is the 478781-st centered octagonal number.

It is an amenable number.

916923068721 is a deficient number, since it is larger than the sum of its proper divisors (538921397082).

916923068721 is an frugal number, since it uses more digits than its factorization.

916923068721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58062 (or 29031 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 916923068721 in words is "nine hundred sixteen billion, nine hundred twenty-three million, sixty-eight thousand, seven hundred twenty-one".