66953651 has 2 divisors, whose sum is σ = 66953652. Its totient is φ = 66953650.

The previous prime is 66953647. The next prime is 66953729. The reversal of 66953651 is 15635966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66953651 - 2² = 66953647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66953599 and 66953608.

It is not a weakly prime, because it can be changed into another prime (66953611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33476825 + 33476826.

It is an arithmetic number, because the mean of its divisors is an integer number (33476826).

Almost surely, 2^66953651 is an apocalyptic number.

66953651 is a deficient number, since it is larger than the sum of its proper divisors (1).

66953651 is an equidigital number, since it uses as much as digits as its factorization.

66953651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 41.

The square root of 66953651 is about 8182.5210662729. The cubic root of 66953651 is about 406.0611323738.

The spelling of 66953651 in words is "sixty-six million, nine hundred fifty-three thousand, six hundred fifty-one".