66952553 has 2 divisors, whose sum is σ = 66952554. Its totient is φ = 66952552.

The previous prime is 66952541. The next prime is 66952559. The reversal of 66952553 is 35525966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40615129 + 26337424 = 6373^2 + 5132^2 .

It is a cyclic number.

It is not a de Polignac number, because 66952553 - 2⁶ = 66952489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66952553.

It is not a weakly prime, because it can be changed into another prime (66952559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33476276 + 33476277.

It is an arithmetic number, because the mean of its divisors is an integer number (33476277).

Almost surely, 2^66952553 is an apocalyptic number.

It is an amenable number.

66952553 is a deficient number, since it is larger than the sum of its proper divisors (1).

66952553 is an equidigital number, since it uses as much as digits as its factorization.

66952553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243000, while the sum is 41.

The square root of 66952553 is about 8182.4539717618. The cubic root of 66952553 is about 406.0589126414.

The spelling of 66952553 in words is "sixty-six million, nine hundred fifty-two thousand, five hundred fifty-three".