66677531 has 2 divisors, whose sum is σ = 66677532. Its totient is φ = 66677530.

The previous prime is 66677503. The next prime is 66677539. The reversal of 66677531 is 13577666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66677531 - 2¹⁰ = 66676507 is a prime.

It is a super-2 number, since 2×66677531² = 8891786280511922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66677539) 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, 33338765 + 33338766.

It is an arithmetic number, because the mean of its divisors is an integer number (33338766).

Almost surely, 2^66677531 is an apocalyptic number.

66677531 is a deficient number, since it is larger than the sum of its proper divisors (1).

66677531 is an equidigital number, since it uses as much as digits as its factorization.

66677531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 41.

The square root of 66677531 is about 8165.6310840008. The cubic root of 66677531 is about 405.5021581985.

The spelling of 66677531 in words is "sixty-six million, six hundred seventy-seven thousand, five hundred thirty-one".