164276477021 has 2 divisors, whose sum is σ = 164276477022. Its totient is φ = 164276477020.

The previous prime is 164276477003. The next prime is 164276477023. The reversal of 164276477021 is 120774672461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118174375225 + 46102101796 = 343765^2 + 214714^2 .

It is an emirp because it is prime and its reverse (120774672461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164276477021 - 2¹⁴ = 164276460637 is a prime.

It is a super-2 number, since 2×164276477021² (a number of 23 digits) contains 22 as substring.

Together with 164276477023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164276477023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82138238510 + 82138238511.

It is an arithmetic number, because the mean of its divisors is an integer number (82138238511).

Almost surely, 2^164276477021 is an apocalyptic number.

It is an amenable number.

164276477021 is a deficient number, since it is larger than the sum of its proper divisors (1).

164276477021 is an equidigital number, since it uses as much as digits as its factorization.

164276477021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 790272, while the sum is 47.

The spelling of 164276477021 in words is "one hundred sixty-four billion, two hundred seventy-six million, four hundred seventy-seven thousand, twenty-one".