167649442381 has 2 divisors, whose sum is σ = 167649442382. Its totient is φ = 167649442380.

The previous prime is 167649442379. The next prime is 167649442421. The reversal of 167649442381 is 183244946761.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147962546281 + 19686896100 = 384659^2 + 140310^2 .

It is a cyclic number.

It is not a de Polignac number, because 167649442381 - 2¹ = 167649442379 is a prime.

It is a super-2 number, since 2×167649442381² (a number of 23 digits) contains 22 as substring.

Together with 167649442379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167649449381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83824721190 + 83824721191.

It is an arithmetic number, because the mean of its divisors is an integer number (83824721191).

Almost surely, 2^167649442381 is an apocalyptic number.

It is an amenable number.

167649442381 is a deficient number, since it is larger than the sum of its proper divisors (1).

167649442381 is an equidigital number, since it uses as much as digits as its factorization.

167649442381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 55.

The spelling of 167649442381 in words is "one hundred sixty-seven billion, six hundred forty-nine million, four hundred forty-two thousand, three hundred eighty-one".