66229531 has 2 divisors, whose sum is σ = 66229532. Its totient is φ = 66229530.

The previous prime is 66229523. The next prime is 66229543. The reversal of 66229531 is 13592266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66229531 - 2³ = 66229523 is a prime.

It is a super-2 number, since 2×66229531² = 8772701552959922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66229511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33114765 + 33114766.

It is an arithmetic number, because the mean of its divisors is an integer number (33114766).

Almost surely, 2^66229531 is an apocalyptic number.

66229531 is a deficient number, since it is larger than the sum of its proper divisors (1).

66229531 is an equidigital number, since it uses as much as digits as its factorization.

66229531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 66229531 is about 8138.1528002367. The cubic root of 66229531 is about 404.5919397540.

The spelling of 66229531 in words is "sixty-six million, two hundred twenty-nine thousand, five hundred thirty-one".