66456331 has 2 divisors, whose sum is σ = 66456332. Its totient is φ = 66456330.

The previous prime is 66456323. The next prime is 66456347. The reversal of 66456331 is 13365466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66456331 - 2³ = 66456323 is a prime.

It is a super-2 number, since 2×66456331² = 8832887859963122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66456311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33228165 + 33228166.

It is an arithmetic number, because the mean of its divisors is an integer number (33228166).

Almost surely, 2^66456331 is an apocalyptic number.

66456331 is a deficient number, since it is larger than the sum of its proper divisors (1).

66456331 is an equidigital number, since it uses as much as digits as its factorization.

66456331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 34.

The square root of 66456331 is about 8152.0752572581. The cubic root of 66456331 is about 405.0532491079.

The spelling of 66456331 in words is "sixty-six million, four hundred fifty-six thousand, three hundred thirty-one".