720518870161 has 2 divisors, whose sum is σ = 720518870162. Its totient is φ = 720518870160.

The previous prime is 720518870089. The next prime is 720518870189. The reversal of 720518870161 is 161078815027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 520100592400 + 200418277761 = 721180^2 + 447681^2 .

It is a cyclic number.

It is not a de Polignac number, because 720518870161 - 2¹⁵ = 720518837393 is a prime.

It is not a weakly prime, because it can be changed into another prime (720518873161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360259435080 + 360259435081.

It is an arithmetic number, because the mean of its divisors is an integer number (360259435081).

Almost surely, 2^720518870161 is an apocalyptic number.

It is an amenable number.

720518870161 is a deficient number, since it is larger than the sum of its proper divisors (1).

720518870161 is an equidigital number, since it uses as much as digits as its factorization.

720518870161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 188160, while the sum is 46.

The spelling of 720518870161 in words is "seven hundred twenty billion, five hundred eighteen million, eight hundred seventy thousand, one hundred sixty-one".