66153631 has 2 divisors, whose sum is σ = 66153632. Its totient is φ = 66153630.

The previous prime is 66153587. The next prime is 66153667. The reversal of 66153631 is 13635166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66153631 - 2⁹ = 66153119 is a prime.

It is a super-2 number, since 2×66153631² = 8752605788968322, which contains 22 as substring.

It is equal to p_3904654 and since 66153631 and 3904654 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 66153593 and 66153602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66153671) 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, 33076815 + 33076816.

It is an arithmetic number, because the mean of its divisors is an integer number (33076816).

Almost surely, 2^66153631 is an apocalyptic number.

66153631 is a deficient number, since it is larger than the sum of its proper divisors (1).

66153631 is an equidigital number, since it uses as much as digits as its factorization.

66153631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 31.

The square root of 66153631 is about 8133.4882430603. The cubic root of 66153631 is about 404.4373246045.

Adding to 66153631 its reverse (13635166), we get a palindrome (79788797).

The spelling of 66153631 in words is "sixty-six million, one hundred fifty-three thousand, six hundred thirty-one".