66196549 has 4 divisors (see below), whose sum is σ = 67034560. Its totient is φ = 65358540.

The previous prime is 66196541. The next prime is 66196561. The reversal of 66196549 is 94569166.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94569166 = 2 ⋅47284583.

It is a cyclic number.

It is not a de Polignac number, because 66196549 - 2³ = 66196541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66196499 and 66196508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66196541) 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, 418887 + ... + 419044.

It is an arithmetic number, because the mean of its divisors is an integer number (16758640).

Almost surely, 2^66196549 is an apocalyptic number.

It is an amenable number.

66196549 is a deficient number, since it is larger than the sum of its proper divisors (838011).

66196549 is an equidigital number, since it uses as much as digits as its factorization.

66196549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838010.

The product of its digits is 349920, while the sum is 46.

The square root of 66196549 is about 8136.1261666717. The cubic root of 66196549 is about 404.5247669642.

The spelling of 66196549 in words is "sixty-six million, one hundred ninety-six thousand, five hundred forty-nine".