164651566 has 16 divisors (see below), whose sum is σ = 251568720. Its totient is φ = 80801280.

The previous prime is 164651561. The next prime is 164651567. The reversal of 164651566 is 665156461.

It is a super-2 number, since 2×164651566² = 54220276372504712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164651561) 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, 69225 + ... + 71563.

It is an arithmetic number, because the mean of its divisors is an integer number (15723045).

Almost surely, 2^164651566 is an apocalyptic number.

164651566 is a deficient number, since it is larger than the sum of its proper divisors (86917154).

164651566 is a wasteful number, since it uses less digits than its factorization.

164651566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979.

The product of its digits is 129600, while the sum is 40.

The square root of 164651566 is about 12831.6626358395. The cubic root of 164651566 is about 548.0943037486.

The spelling of 164651566 in words is "one hundred sixty-four million, six hundred fifty-one thousand, five hundred sixty-six".