2164406643979 has 2 divisors, whose sum is σ = 2164406643980. Its totient is φ = 2164406643978.

The previous prime is 2164406643967. The next prime is 2164406644033. The reversal of 2164406643979 is 9793466044612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2164406643979 - 2³⁷ = 2026967690507 is a prime.

It is a super-2 number, since 2×2164406643979² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2164406643379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082203321989 + 1082203321990.

It is an arithmetic number, because the mean of its divisors is an integer number (1082203321990).

Almost surely, 2^{2164406643979} is an apocalyptic number.

2164406643979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2164406643979 is an equidigital number, since it uses as much as digits as its factorization.

2164406643979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47029248, while the sum is 61.

The spelling of 2164406643979 in words is "two trillion, one hundred sixty-four billion, four hundred six million, six hundred forty-three thousand, nine hundred seventy-nine".