66751331 has 2 divisors, whose sum is σ = 66751332. Its totient is φ = 66751330.

The previous prime is 66751303. The next prime is 66751337. The reversal of 66751331 is 13315766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66751331 - 2¹⁸ = 66489187 is a prime.

It is a super-2 number, since 2×66751331² = 8911480380543122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66751337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33375665 + 33375666.

It is an arithmetic number, because the mean of its divisors is an integer number (33375666).

Almost surely, 2^66751331 is an apocalyptic number.

66751331 is a deficient number, since it is larger than the sum of its proper divisors (1).

66751331 is an equidigital number, since it uses as much as digits as its factorization.

66751331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 32.

The square root of 66751331 is about 8170.1487746552. The cubic root of 66751331 is about 405.6517089526.

The spelling of 66751331 in words is "sixty-six million, seven hundred fifty-one thousand, three hundred thirty-one".