164535643974 has 64 divisors (see below), whose sum is σ = 357244945344. Its totient is φ = 50218285056.

The previous prime is 164535643969. The next prime is 164535643997. The reversal of 164535643974 is 479346535461.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15949042 + ... + 15959354.

It is an arithmetic number, because the mean of its divisors is an integer number (5581952271).

Almost surely, 2^164535643974 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 164535643974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178622472672).

164535643974 is an abundant number, since it is smaller than the sum of its proper divisors (192709301370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

164535643974 is a wasteful number, since it uses less digits than its factorization.

164535643974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11961.

The product of its digits is 32659200, while the sum is 57.

The spelling of 164535643974 in words is "one hundred sixty-four billion, five hundred thirty-five million, six hundred forty-three thousand, nine hundred seventy-four".