66938801 has 2 divisors, whose sum is σ = 66938802. Its totient is φ = 66938800.

The previous prime is 66938797. The next prime is 66938821. The reversal of 66938801 is 10883966.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62094400 + 4844401 = 7880^2 + 2201^2 .

It is a cyclic number.

It is not a de Polignac number, because 66938801 - 2² = 66938797 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66938821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33469400 + 33469401.

It is an arithmetic number, because the mean of its divisors is an integer number (33469401).

Almost surely, 2^66938801 is an apocalyptic number.

It is an amenable number.

66938801 is a deficient number, since it is larger than the sum of its proper divisors (1).

66938801 is an equidigital number, since it uses as much as digits as its factorization.

66938801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 66938801 is about 8181.6135939068. The cubic root of 66938801 is about 406.0311093475.

The spelling of 66938801 in words is "sixty-six million, nine hundred thirty-eight thousand, eight hundred one".