66162619 has 4 divisors (see below), whose sum is σ = 66178944. Its totient is φ = 66146296.

The previous prime is 66162611. The next prime is 66162641. The reversal of 66162619 is 91626166.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 91626166 = 2 ⋅45813083.

It is a cyclic number.

It is not a de Polignac number, because 66162619 - 2³ = 66162611 is a prime.

It is a super-2 number, since 2×66162619² = 8754984305878322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66162611) 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, 3069 + ... + 11905.

It is an arithmetic number, because the mean of its divisors is an integer number (16544736).

Almost surely, 2^66162619 is an apocalyptic number.

66162619 is a deficient number, since it is larger than the sum of its proper divisors (16325).

66162619 is an equidigital number, since it uses as much as digits as its factorization.

66162619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16324.

The product of its digits is 23328, while the sum is 37.

The square root of 66162619 is about 8134.0407547541. The cubic root of 66162619 is about 404.4556401427.

The spelling of 66162619 in words is "sixty-six million, one hundred sixty-two thousand, six hundred nineteen".