1640907569989 has 2 divisors, whose sum is σ = 1640907569990. Its totient is φ = 1640907569988.

The previous prime is 1640907569971. The next prime is 1640907570079. The reversal of 1640907569989 is 9899657090461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1622968985764 + 17938584225 = 1273958^2 + 133935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640907569989 - 2¹⁷ = 1640907438917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640907569089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820453784994 + 820453784995.

It is an arithmetic number, because the mean of its divisors is an integer number (820453784995).

Almost surely, 2^{1640907569989} is an apocalyptic number.

It is an amenable number.

1640907569989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640907569989 is an equidigital number, since it uses as much as digits as its factorization.

1640907569989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 264539520, while the sum is 73.

The spelling of 1640907569989 in words is "one trillion, six hundred forty billion, nine hundred seven million, five hundred sixty-nine thousand, nine hundred eighty-nine".