164021738269 has 4 divisors (see below), whose sum is σ = 164927935900. Its totient is φ = 163115540640.

The previous prime is 164021738263. The next prime is 164021738303. The reversal of 164021738269 is 962837120461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70164063225 + 93857675044 = 264885^2 + 306362^2 .

It is a cyclic number.

It is not a de Polignac number, because 164021738269 - 2²¹ = 164019641117 is a prime.

It is a super-2 number, since 2×164021738269² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164021738263) 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, 453098544 + ... + 453098905.

It is an arithmetic number, because the mean of its divisors is an integer number (41231983975).

Almost surely, 2^164021738269 is an apocalyptic number.

It is an amenable number.

164021738269 is a deficient number, since it is larger than the sum of its proper divisors (906197631).

164021738269 is an equidigital number, since it uses as much as digits as its factorization.

164021738269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906197630.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 164021738269 in words is "one hundred sixty-four billion, twenty-one million, seven hundred thirty-eight thousand, two hundred sixty-nine".