67161621 has 4 divisors (see below), whose sum is σ = 89548832. Its totient is φ = 44774412.

The previous prime is 67161583. The next prime is 67161641. The reversal of 67161621 is 12616176.

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 not a de Polignac number, because 67161621 - 2⁹ = 67161109 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 (67161641) 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, 11193601 + ... + 11193606.

It is an arithmetic number, because the mean of its divisors is an integer number (22387208).

Almost surely, 2^67161621 is an apocalyptic number.

It is an amenable number.

67161621 is a deficient number, since it is larger than the sum of its proper divisors (22387211).

67161621 is a wasteful number, since it uses less digits than its factorization.

67161621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22387210.

The product of its digits is 3024, while the sum is 30.

The square root of 67161621 is about 8195.2193991375. The cubic root of 67161621 is about 406.4811306144.

Adding to 67161621 its reverse (12616176), we get a palindrome (79777797).

The spelling of 67161621 in words is "sixty-seven million, one hundred sixty-one thousand, six hundred twenty-one".