164556551 has 2 divisors, whose sum is σ = 164556552. Its totient is φ = 164556550.

The previous prime is 164556533. The next prime is 164556563. The reversal of 164556551 is 155655461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 164556551 - 2¹⁰ = 164555527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164556521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82278275 + 82278276.

It is an arithmetic number, because the mean of its divisors is an integer number (82278276).

Almost surely, 2^164556551 is an apocalyptic number.

164556551 is a deficient number, since it is larger than the sum of its proper divisors (1).

164556551 is an equidigital number, since it uses as much as digits as its factorization.

164556551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90000, while the sum is 38.

The square root of 164556551 is about 12827.9597364507. The cubic root of 164556551 is about 547.9888544006.

The spelling of 164556551 in words is "one hundred sixty-four million, five hundred fifty-six thousand, five hundred fifty-one".