164662121641 has 4 divisors (see below), whose sum is σ = 164706955732. Its totient is φ = 164617287552.

The previous prime is 164662121627. The next prime is 164662121647. The reversal of 164662121641 is 146121266461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146121266461 = 383 ⋅381517667.

It can be written as a sum of positive squares in 2 ways, for example, as 10240630416 + 154421491225 = 101196^2 + 392965^2 .

It is a cyclic number.

It is not a de Polignac number, because 164662121641 - 2⁷ = 164662121513 is a prime.

It is a super-2 number, since 2×164662121641² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164662121594 and 164662121603.

It is not an unprimeable number, because it can be changed into a prime (164662121647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22411536 + ... + 22418881.

It is an arithmetic number, because the mean of its divisors is an integer number (41176738933).

Almost surely, 2^164662121641 is an apocalyptic number.

It is an amenable number.

164662121641 is a deficient number, since it is larger than the sum of its proper divisors (44834091).

164662121641 is an equidigital number, since it uses as much as digits as its factorization.

164662121641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44834090.

The product of its digits is 82944, while the sum is 40.

The spelling of 164662121641 in words is "one hundred sixty-four billion, six hundred sixty-two million, one hundred twenty-one thousand, six hundred forty-one".