2172867757609 has 2 divisors, whose sum is σ = 2172867757610. Its totient is φ = 2172867757608.

The previous prime is 2172867757603. The next prime is 2172867757639. The reversal of 2172867757609 is 9067577682712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2020477459225 + 152390298384 = 1421435^2 + 390372^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172867757609 - 2²¹ = 2172865660457 is a prime.

It is not a weakly prime, because it can be changed into another prime (2172867757603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086433878804 + 1086433878805.

It is an arithmetic number, because the mean of its divisors is an integer number (1086433878805).

Almost surely, 2^{2172867757609} is an apocalyptic number.

It is an amenable number.

2172867757609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172867757609 is an equidigital number, since it uses as much as digits as its factorization.

2172867757609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124467840, while the sum is 67.

The spelling of 2172867757609 in words is "two trillion, one hundred seventy-two billion, eight hundred sixty-seven million, seven hundred fifty-seven thousand, six hundred nine".