164231556543 has 6 divisors (see below), whose sum is σ = 237223359464. Its totient is φ = 109487704356.

The previous prime is 164231556473. The next prime is 164231556547. The reversal of 164231556543 is 345655132461.

It is a happy number.

164231556543 is a `hidden beast` number, since 1 + 6 + 42 + 3 + 1 + 5 + 565 + 43 = 666.

It is not a de Polignac number, because 164231556543 - 2⁹ = 164231556031 is a prime.

It is a super-2 number, since 2×164231556543² (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 (164231556547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9123975355 + ... + 9123975372.

Almost surely, 2^164231556543 is an apocalyptic number.

164231556543 is a deficient number, since it is larger than the sum of its proper divisors (72991802921).

164231556543 is a wasteful number, since it uses less digits than its factorization.

164231556543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18247950733 (or 18247950730 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 45.

The spelling of 164231556543 in words is "one hundred sixty-four billion, two hundred thirty-one million, five hundred fifty-six thousand, five hundred forty-three".