66627801 has 6 divisors (see below), whose sum is σ = 96240170. Its totient is φ = 44418528.

The previous prime is 66627797. The next prime is 66627809. The reversal of 66627801 is 10872666.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 56610576 + 10017225 = 7524^2 + 3165^2 .

It is not a de Polignac number, because 66627801 - 2² = 66627797 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66627809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3701536 + ... + 3701553.

Almost surely, 2^66627801 is an apocalyptic number.

It is an amenable number.

66627801 is a deficient number, since it is larger than the sum of its proper divisors (29612369).

66627801 is a wasteful number, since it uses less digits than its factorization.

66627801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7403095 (or 7403092 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 66627801 is about 8162.5854360000. The cubic root of 66627801 is about 405.4013214425.

The spelling of 66627801 in words is "sixty-six million, six hundred twenty-seven thousand, eight hundred one".