66528431 has 2 divisors, whose sum is σ = 66528432. Its totient is φ = 66528430.

The previous prime is 66528419. The next prime is 66528461. The reversal of 66528431 is 13482566.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66528431 is a prime.

It is a super-2 number, since 2×66528431² = 8852064262643522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66528391 and 66528400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66528461) 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, 33264215 + 33264216.

It is an arithmetic number, because the mean of its divisors is an integer number (33264216).

Almost surely, 2^66528431 is an apocalyptic number.

66528431 is a deficient number, since it is larger than the sum of its proper divisors (1).

66528431 is an equidigital number, since it uses as much as digits as its factorization.

66528431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 66528431 is about 8156.4962453249. The cubic root of 66528431 is about 405.1996800232.

The spelling of 66528431 in words is "sixty-six million, five hundred twenty-eight thousand, four hundred thirty-one".