66912853 has 4 divisors (see below), whose sum is σ = 76471840. Its totient is φ = 57353868.

The previous prime is 66912847. The next prime is 66912877. The reversal of 66912853 is 35821966.

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 66912853 - 2⁵ = 66912821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66912253) 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, 4779483 + ... + 4779496.

It is an arithmetic number, because the mean of its divisors is an integer number (19117960).

Almost surely, 2^66912853 is an apocalyptic number.

It is an amenable number.

66912853 is a deficient number, since it is larger than the sum of its proper divisors (9558987).

66912853 is an equidigital number, since it uses as much as digits as its factorization.

66912853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9558986.

The product of its digits is 77760, while the sum is 40.

The square root of 66912853 is about 8180.0276894397. The cubic root of 66912853 is about 405.9786382510.

The spelling of 66912853 in words is "sixty-six million, nine hundred twelve thousand, eight hundred fifty-three".