78222021167 has 2 divisors, whose sum is σ = 78222021168. Its totient is φ = 78222021166.

The previous prime is 78222021121. The next prime is 78222021169. The reversal of 78222021167 is 76112022287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78222021167 - 2¹⁰ = 78222020143 is a prime.

It is a super-2 number, since 2×78222021167² (a number of 23 digits) contains 22 as substring.

Together with 78222021169, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78222021167.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78222021169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39111010583 + 39111010584.

It is an arithmetic number, because the mean of its divisors is an integer number (39111010584).

Almost surely, 2^78222021167 is an apocalyptic number.

78222021167 is a deficient number, since it is larger than the sum of its proper divisors (1).

78222021167 is an equidigital number, since it uses as much as digits as its factorization.

78222021167 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 38.

The spelling of 78222021167 in words is "seventy-eight billion, two hundred twenty-two million, twenty-one thousand, one hundred sixty-seven".