66490853 has 24 divisors (see below), whose sum is σ = 80320896. Its totient is φ = 54537600.

The previous prime is 66490847. The next prime is 66490873. The reversal of 66490853 is 35809466.

It is not a de Polignac number, because 66490853 - 2¹⁴ = 66474469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66490853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66490843) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86993 + ... + 87753.

It is an arithmetic number, because the mean of its divisors is an integer number (3346704).

Almost surely, 2^66490853 is an apocalyptic number.

It is an amenable number.

66490853 is a deficient number, since it is larger than the sum of its proper divisors (13830043).

66490853 is a wasteful number, since it uses less digits than its factorization.

66490853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845 (or 832 counting only the distinct ones).

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

The square root of 66490853 is about 8154.1923573092. The cubic root of 66490853 is about 405.1233744943.

The spelling of 66490853 in words is "sixty-six million, four hundred ninety thousand, eight hundred fifty-three".