66153803 has 2 divisors, whose sum is σ = 66153804. Its totient is φ = 66153802.

The previous prime is 66153781. The next prime is 66153883. The reversal of 66153803 is 30835166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66153803 - 2⁸ = 66153547 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66153803.

It is not a weakly prime, because it can be changed into another prime (66153883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33076901 + 33076902.

It is an arithmetic number, because the mean of its divisors is an integer number (33076902).

Almost surely, 2^66153803 is an apocalyptic number.

66153803 is a deficient number, since it is larger than the sum of its proper divisors (1).

66153803 is an equidigital number, since it uses as much as digits as its factorization.

66153803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 66153803 is about 8133.4988166225. The cubic root of 66153803 is about 404.4376751177.

Adding to 66153803 its reverse (30835166), we get a palindrome (96988969).

The spelling of 66153803 in words is "sixty-six million, one hundred fifty-three thousand, eight hundred three".