667081619 has 4 divisors (see below), whose sum is σ = 667170144. Its totient is φ = 666993096.

The previous prime is 667081607. The next prime is 667081637. The reversal of 667081619 is 916180766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 916180766 = 2 ⋅458090383.

It is a cyclic number.

It is not a de Polignac number, because 667081619 - 2¹⁶ = 667016083 is a prime.

It is a super-2 number, since 2×667081619² = 889995772815322322, which contains 22 as substring.

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 667081619.

It is not an unprimeable number, because it can be changed into a prime (667086619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31787 + ... + 48420.

It is an arithmetic number, because the mean of its divisors is an integer number (166792536).

Almost surely, 2^667081619 is an apocalyptic number.

667081619 is a deficient number, since it is larger than the sum of its proper divisors (88525).

667081619 is an equidigital number, since it uses as much as digits as its factorization.

667081619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88524.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 667081619 is about 25827.9232421037. The cubic root of 667081619 is about 873.7616742709.

The spelling of 667081619 in words is "six hundred sixty-seven million, eighty-one thousand, six hundred nineteen".