77021913784219 has 2 divisors, whose sum is σ = 77021913784220. Its totient is φ = 77021913784218.

The previous prime is 77021913784199. The next prime is 77021913784223. The reversal of 77021913784219 is 91248731912077.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77021913784219 - 2³⁹ = 76472157970331 is a prime.

It is a super-2 number, since 2×77021913784219² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77021913784819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38510956892109 + 38510956892110.

It is an arithmetic number, because the mean of its divisors is an integer number (38510956892110).

Almost surely, 2^{77021913784219} is an apocalyptic number.

77021913784219 is a deficient number, since it is larger than the sum of its proper divisors (1).

77021913784219 is an equidigital number, since it uses as much as digits as its factorization.

77021913784219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10668672, while the sum is 61.

The spelling of 77021913784219 in words is "seventy-seven trillion, twenty-one billion, nine hundred thirteen million, seven hundred eighty-four thousand, two hundred nineteen".