720021902057 has 2 divisors, whose sum is σ = 720021902058. Its totient is φ = 720021902056.

The previous prime is 720021902003. The next prime is 720021902063. The reversal of 720021902057 is 750209120027.

720021902057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 717647873881 + 2374028176 = 847141^2 + 48724^2 .

It is a cyclic number.

It is not a de Polignac number, because 720021902057 - 2⁸ = 720021901801 is a prime.

It is not a weakly prime, because it can be changed into another prime (720021902857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360010951028 + 360010951029.

It is an arithmetic number, because the mean of its divisors is an integer number (360010951029).

Almost surely, 2^720021902057 is an apocalyptic number.

It is an amenable number.

720021902057 is a deficient number, since it is larger than the sum of its proper divisors (1).

720021902057 is an equidigital number, since it uses as much as digits as its factorization.

720021902057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 35.

The spelling of 720021902057 in words is "seven hundred twenty billion, twenty-one million, nine hundred two thousand, fifty-seven".