66552131 has 2 divisors, whose sum is σ = 66552132. Its totient is φ = 66552130.

The previous prime is 66552121. The next prime is 66552163. The reversal of 66552131 is 13125566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66552131 - 2⁶ = 66552067 is a prime.

It is a super-2 number, since 2×66552131² = 8858372281282322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 66552094 and 66552103.

It is not a weakly prime, because it can be changed into another prime (66552121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33276065 + 33276066.

It is an arithmetic number, because the mean of its divisors is an integer number (33276066).

Almost surely, 2^66552131 is an apocalyptic number.

66552131 is a deficient number, since it is larger than the sum of its proper divisors (1).

66552131 is an equidigital number, since it uses as much as digits as its factorization.

66552131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

The square root of 66552131 is about 8157.9489456603. The cubic root of 66552131 is about 405.2477902429.

Adding to 66552131 its reverse (13125566), we get a palindrome (79677697).

The spelling of 66552131 in words is "sixty-six million, five hundred fifty-two thousand, one hundred thirty-one".