1954669811009 has 2 divisors, whose sum is σ = 1954669811010. Its totient is φ = 1954669811008.

The previous prime is 1954669810993. The next prime is 1954669811027. The reversal of 1954669811009 is 9001189664591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1859055894784 + 95613916225 = 1363472^2 + 309215^2 .

It is an emirp because it is prime and its reverse (9001189664591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1954669811009 - 2⁴ = 1954669810993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1954669811089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977334905504 + 977334905505.

It is an arithmetic number, because the mean of its divisors is an integer number (977334905505).

Almost surely, 2^{1954669811009} is an apocalyptic number.

It is an amenable number.

1954669811009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1954669811009 is an equidigital number, since it uses as much as digits as its factorization.

1954669811009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 59.

The spelling of 1954669811009 in words is "one trillion, nine hundred fifty-four billion, six hundred sixty-nine million, eight hundred eleven thousand, nine".