164212550665 has 16 divisors (see below), whose sum is σ = 202590381312. Its totient is φ = 127687178304.

The previous prime is 164212550609. The next prime is 164212550693. The reversal of 164212550665 is 566055212461.

It is a cyclic number.

It is not a de Polignac number, because 164212550665 - 2¹⁷ = 164212419593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280069 + ... + 637858.

It is an arithmetic number, because the mean of its divisors is an integer number (12661898832).

Almost surely, 2^164212550665 is an apocalyptic number.

It is an amenable number.

164212550665 is a deficient number, since it is larger than the sum of its proper divisors (38377830647).

164212550665 is an equidigital number, since it uses as much as digits as its factorization.

164212550665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918936.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 164212550665 in words is "one hundred sixty-four billion, two hundred twelve million, five hundred fifty thousand, six hundred sixty-five".