720926987689 has 2 divisors, whose sum is σ = 720926987690. Its totient is φ = 720926987688.

The previous prime is 720926987663. The next prime is 720926987699. The reversal of 720926987689 is 986789629027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398297307664 + 322629680025 = 631108^2 + 568005^2 .

It is a cyclic number.

It is not a de Polignac number, because 720926987689 - 2²³ = 720918599081 is a prime.

It is not a weakly prime, because it can be changed into another prime (720926987639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360463493844 + 360463493845.

It is an arithmetic number, because the mean of its divisors is an integer number (360463493845).

Almost surely, 2^720926987689 is an apocalyptic number.

It is an amenable number.

720926987689 is a deficient number, since it is larger than the sum of its proper divisors (1).

720926987689 is an equidigital number, since it uses as much as digits as its factorization.

720926987689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 329204736, while the sum is 73.

The spelling of 720926987689 in words is "seven hundred twenty billion, nine hundred twenty-six million, nine hundred eighty-seven thousand, six hundred eighty-nine".