164719891957 has 2 divisors, whose sum is σ = 164719891958. Its totient is φ = 164719891956.

The previous prime is 164719891933. The next prime is 164719892011. The reversal of 164719891957 is 759198917461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128996623921 + 35723268036 = 359161^2 + 189006^2 .

It is an emirp because it is prime and its reverse (759198917461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164719891957 - 2¹¹ = 164719889909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 164719891892 and 164719891901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164719892957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82359945978 + 82359945979.

It is an arithmetic number, because the mean of its divisors is an integer number (82359945979).

Almost surely, 2^164719891957 is an apocalyptic number.

It is an amenable number.

164719891957 is a deficient number, since it is larger than the sum of its proper divisors (1).

164719891957 is an equidigital number, since it uses as much as digits as its factorization.

164719891957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34292160, while the sum is 67.

The spelling of 164719891957 in words is "one hundred sixty-four billion, seven hundred nineteen million, eight hundred ninety-one thousand, nine hundred fifty-seven".