68161619 has 4 divisors (see below), whose sum is σ = 72171144. Its totient is φ = 64152096.

The previous prime is 68161603. The next prime is 68161631. The reversal of 68161619 is 91616186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68161619 - 2⁴ = 68161603 is a prime.

It is a super-2 number, since 2×68161619² = 9292012609402322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68161699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004737 + ... + 2004770.

It is an arithmetic number, because the mean of its divisors is an integer number (18042786).

Almost surely, 2^68161619 is an apocalyptic number.

68161619 is a deficient number, since it is larger than the sum of its proper divisors (4009525).

68161619 is a wasteful number, since it uses less digits than its factorization.

68161619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4009524.

The product of its digits is 15552, while the sum is 38.

The square root of 68161619 is about 8256.0050266458. The cubic root of 68161619 is about 408.4886234657.

The spelling of 68161619 in words is "sixty-eight million, one hundred sixty-one thousand, six hundred nineteen".