66418753 has 2 divisors, whose sum is σ = 66418754. Its totient is φ = 66418752.

The previous prime is 66418741. The next prime is 66418757. The reversal of 66418753 is 35781466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33837489 + 32581264 = 5817^2 + 5708^2 .

It is a cyclic number.

It is not a de Polignac number, because 66418753 - 2⁵ = 66418721 is a prime.

It is a super-2 number, since 2×66418753² = 8822901500150018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66418757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33209376 + 33209377.

It is an arithmetic number, because the mean of its divisors is an integer number (33209377).

Almost surely, 2^66418753 is an apocalyptic number.

It is an amenable number.

66418753 is a deficient number, since it is larger than the sum of its proper divisors (1).

66418753 is an equidigital number, since it uses as much as digits as its factorization.

66418753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 66418753 is about 8149.7701194574. The cubic root of 66418753 is about 404.9768883829.

The spelling of 66418753 in words is "sixty-six million, four hundred eighteen thousand, seven hundred fifty-three".