66804953 has 4 divisors (see below), whose sum is σ = 66835200. Its totient is φ = 66774708.

The previous prime is 66804937. The next prime is 66804961. The reversal of 66804953 is 35940866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66804953 - 2⁴ = 66804937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66804953.

It is not an unprimeable number, because it can be changed into a prime (66804923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11525 + ... + 16322.

It is an arithmetic number, because the mean of its divisors is an integer number (16708800).

Almost surely, 2^66804953 is an apocalyptic number.

It is an amenable number.

66804953 is a deficient number, since it is larger than the sum of its proper divisors (30247).

66804953 is a wasteful number, since it uses less digits than its factorization.

66804953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30246.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 66804953 is about 8173.4296962781. The cubic root of 66804953 is about 405.7603012145.

The spelling of 66804953 in words is "sixty-six million, eight hundred four thousand, nine hundred fifty-three".