66736477 has 2 divisors, whose sum is σ = 66736478. Its totient is φ = 66736476.

The previous prime is 66736469. The next prime is 66736507. The reversal of 66736477 is 77463766.

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., 59305401 + 7431076 = 7701^2 + 2726^2 .

It is a cyclic number.

It is not a de Polignac number, because 66736477 - 2³ = 66736469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66736177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33368238 + 33368239.

It is an arithmetic number, because the mean of its divisors is an integer number (33368239).

Almost surely, 2^66736477 is an apocalyptic number.

It is an amenable number.

66736477 is a deficient number, since it is larger than the sum of its proper divisors (1).

66736477 is an equidigital number, since it uses as much as digits as its factorization.

66736477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 46.

The square root of 66736477 is about 8169.2396831039. The cubic root of 66736477 is about 405.6216171807.

The spelling of 66736477 in words is "sixty-six million, seven hundred thirty-six thousand, four hundred seventy-seven".