164136561 has 8 divisors (see below), whose sum is σ = 219038784. Its totient is φ = 109329360.

The previous prime is 164136541. The next prime is 164136563. The reversal of 164136561 is 165631461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 164136561 - 2⁵ = 164136529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (164136563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19621 + ... + 26706.

It is an arithmetic number, because the mean of its divisors is an integer number (27379848).

Almost surely, 2^164136561 is an apocalyptic number.

It is an amenable number.

164136561 is a deficient number, since it is larger than the sum of its proper divisors (54902223).

164136561 is a wasteful number, since it uses less digits than its factorization.

164136561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47511.

The product of its digits is 12960, while the sum is 33.

The square root of 164136561 is about 12811.5791766667. The cubic root of 164136561 is about 547.5222550950.

The spelling of 164136561 in words is "one hundred sixty-four million, one hundred thirty-six thousand, five hundred sixty-one".