164578531556 has 12 divisors (see below), whose sum is σ = 288017194668. Its totient is φ = 82287904512.

The previous prime is 164578531549. The next prime is 164578531561. The reversal of 164578531556 is 655135875461.

It can be written as a sum of positive squares in 2 ways, for example, as 120663137956 + 43915393600 = 347366^2 + 209560^2 .

It is a super-2 number, since 2×164578531556² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38561 + ... + 575016.

It is an arithmetic number, because the mean of its divisors is an integer number (24001432889).

Almost surely, 2^164578531556 is an apocalyptic number.

It is an amenable number.

164578531556 is a deficient number, since it is larger than the sum of its proper divisors (123438663112).

164578531556 is a wasteful number, since it uses less digits than its factorization.

164578531556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680638 (or 680636 counting only the distinct ones).

The product of its digits is 15120000, while the sum is 56.

The spelling of 164578531556 in words is "one hundred sixty-four billion, five hundred seventy-eight million, five hundred thirty-one thousand, five hundred fifty-six".