66163751 has 2 divisors, whose sum is σ = 66163752. Its totient is φ = 66163750.

The previous prime is 66163729. The next prime is 66163753. The reversal of 66163751 is 15736166.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66163751 - 2⁶ = 66163687 is a prime.

Together with 66163753, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66163753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33081875 + 33081876.

It is an arithmetic number, because the mean of its divisors is an integer number (33081876).

Almost surely, 2^66163751 is an apocalyptic number.

66163751 is a deficient number, since it is larger than the sum of its proper divisors (1).

66163751 is an equidigital number, since it uses as much as digits as its factorization.

66163751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 35.

The square root of 66163751 is about 8134.1103385681. The cubic root of 66163751 is about 404.4579467884.

The spelling of 66163751 in words is "sixty-six million, one hundred sixty-three thousand, seven hundred fifty-one".