2139218177777 has 2 divisors, whose sum is σ = 2139218177778. Its totient is φ = 2139218177776.

The previous prime is 2139218177753. The next prime is 2139218177791. The reversal of 2139218177777 is 7777718129312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2089574327296 + 49643850481 = 1445536^2 + 222809^2 .

It is a cyclic number.

It is not a de Polignac number, because 2139218177777 - 2⁶ = 2139218177713 is a prime.

It is not a weakly prime, because it can be changed into another prime (2139218177717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069609088888 + 1069609088889.

It is an arithmetic number, because the mean of its divisors is an integer number (1069609088889).

Almost surely, 2^{2139218177777} is an apocalyptic number.

It is an amenable number.

2139218177777 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139218177777 is an equidigital number, since it uses as much as digits as its factorization.

2139218177777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14521248, while the sum is 62.

The spelling of 2139218177777 in words is "two trillion, one hundred thirty-nine billion, two hundred eighteen million, one hundred seventy-seven thousand, seven hundred seventy-seven".