66963577 has 2 divisors, whose sum is σ = 66963578. Its totient is φ = 66963576.

The previous prime is 66963569. The next prime is 66963583. The reversal of 66963577 is 77536966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60466176 + 6497401 = 7776^2 + 2549^2 .

It is a cyclic number.

It is not a de Polignac number, because 66963577 - 2³ = 66963569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66963577.

It is not a weakly prime, because it can be changed into another prime (66963877) 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, 33481788 + 33481789.

It is an arithmetic number, because the mean of its divisors is an integer number (33481789).

Almost surely, 2^66963577 is an apocalyptic number.

It is an amenable number.

66963577 is a deficient number, since it is larger than the sum of its proper divisors (1).

66963577 is an equidigital number, since it uses as much as digits as its factorization.

66963577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 49.

The square root of 66963577 is about 8183.1275805770. The cubic root of 66963577 is about 406.0811978150.

It can be divided in two parts, 669 and 63577, that added together give a palindrome (64246).

The spelling of 66963577 in words is "sixty-six million, nine hundred sixty-three thousand, five hundred seventy-seven".