66164431 has 2 divisors, whose sum is σ = 66164432. Its totient is φ = 66164430.

The previous prime is 66164411. The next prime is 66164437. The reversal of 66164431 is 13446166.

66164431 is nontrivially palindromic in base 3.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66164431 - 2⁷ = 66164303 is a prime.

It is a super-2 number, since 2×66164431² = 8755463859107522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66164393 and 66164402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66164437) 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, 33082215 + 33082216.

It is an arithmetic number, because the mean of its divisors is an integer number (33082216).

Almost surely, 2^66164431 is an apocalyptic number.

66164431 is a deficient number, since it is larger than the sum of its proper divisors (1).

66164431 is an equidigital number, since it uses as much as digits as its factorization.

66164431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 66164431 is about 8134.1521377461. The cubic root of 66164431 is about 404.4593323934.

The spelling of 66164431 in words is "sixty-six million, one hundred sixty-four thousand, four hundred thirty-one".