66775153 has 2 divisors, whose sum is σ = 66775154. Its totient is φ = 66775152.

The previous prime is 66775123. The next prime is 66775193. The reversal of 66775153 is 35157766.

It is a happy number.

It is an a-pointer prime, because the next prime (66775193) can be obtained adding 66775153 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64834704 + 1940449 = 8052^2 + 1393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66775153 is a prime.

It is not a weakly prime, because it can be changed into another prime (66775103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33387576 + 33387577.

It is an arithmetic number, because the mean of its divisors is an integer number (33387577).

Almost surely, 2^66775153 is an apocalyptic number.

It is an amenable number.

66775153 is a deficient number, since it is larger than the sum of its proper divisors (1).

66775153 is an equidigital number, since it uses as much as digits as its factorization.

66775153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132300, while the sum is 40.

The square root of 66775153 is about 8171.6065127978. The cubic root of 66775153 is about 405.6999591051.

The spelling of 66775153 in words is "sixty-six million, seven hundred seventy-five thousand, one hundred fifty-three".