2177255226989 has 2 divisors, whose sum is σ = 2177255226990. Its totient is φ = 2177255226988.

The previous prime is 2177255226961. The next prime is 2177255227009. The reversal of 2177255226989 is 9896225527712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1824795722500 + 352459504489 = 1350850^2 + 593683^2 .

It is a cyclic number.

It is not a de Polignac number, because 2177255226989 - 2³² = 2172960259693 is a prime.

It is a super-2 number, since 2×2177255226989² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2177255226919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1088627613494 + 1088627613495.

It is an arithmetic number, because the mean of its divisors is an integer number (1088627613495).

Almost surely, 2^{2177255226989} is an apocalyptic number.

It is an amenable number.

2177255226989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2177255226989 is an equidigital number, since it uses as much as digits as its factorization.

2177255226989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76204800, while the sum is 65.

The spelling of 2177255226989 in words is "two trillion, one hundred seventy-seven billion, two hundred fifty-five million, two hundred twenty-six thousand, nine hundred eighty-nine".