2019776471969 has 2 divisors, whose sum is σ = 2019776471970. Its totient is φ = 2019776471968.

The previous prime is 2019776471963. The next prime is 2019776472013. The reversal of 2019776471969 is 9691746779102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1385423161600 + 634353310369 = 1177040^2 + 796463^2 .

It is a cyclic number.

It is not a de Polignac number, because 2019776471969 - 2¹² = 2019776467873 is a prime.

It is a super-2 number, since 2×2019776471969² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2019776471899 and 2019776471908.

It is not a weakly prime, because it can be changed into another prime (2019776471963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1009888235984 + 1009888235985.

It is an arithmetic number, because the mean of its divisors is an integer number (1009888235985).

Almost surely, 2^{2019776471969} is an apocalyptic number.

It is an amenable number.

2019776471969 is a deficient number, since it is larger than the sum of its proper divisors (1).

2019776471969 is an equidigital number, since it uses as much as digits as its factorization.

2019776471969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72013536, while the sum is 68.

The spelling of 2019776471969 in words is "two trillion, nineteen billion, seven hundred seventy-six million, four hundred seventy-one thousand, nine hundred sixty-nine".