164730925921 has 2 divisors, whose sum is σ = 164730925922. Its totient is φ = 164730925920.

The previous prime is 164730925913. The next prime is 164730925951. The reversal of 164730925921 is 129529037461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96387895296 + 68343030625 = 310464^2 + 261425^2 .

It is an emirp because it is prime and its reverse (129529037461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164730925921 - 2³ = 164730925913 is a prime.

It is not a weakly prime, because it can be changed into another prime (164730925951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82365462960 + 82365462961.

It is an arithmetic number, because the mean of its divisors is an integer number (82365462961).

Almost surely, 2^164730925921 is an apocalyptic number.

It is an amenable number.

164730925921 is a deficient number, since it is larger than the sum of its proper divisors (1).

164730925921 is an equidigital number, since it uses as much as digits as its factorization.

164730925921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 164730925921 in words is "one hundred sixty-four billion, seven hundred thirty million, nine hundred twenty-five thousand, nine hundred twenty-one".