1722402989977 has 2 divisors, whose sum is σ = 1722402989978. Its totient is φ = 1722402989976.

The previous prime is 1722402989927. The next prime is 1722402989987. The reversal of 1722402989977 is 7799892042271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1395283050841 + 327119939136 = 1181221^2 + 571944^2 .

It is a cyclic number.

It is not a de Polignac number, because 1722402989977 - 2¹⁹ = 1722402465689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1722402989927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861201494988 + 861201494989.

It is an arithmetic number, because the mean of its divisors is an integer number (861201494989).

Almost surely, 2^{1722402989977} is an apocalyptic number.

It is an amenable number.

1722402989977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1722402989977 is an equidigital number, since it uses as much as digits as its factorization.

1722402989977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64012032, while the sum is 67.

The spelling of 1722402989977 in words is "one trillion, seven hundred twenty-two billion, four hundred two million, nine hundred eighty-nine thousand, nine hundred seventy-seven".