67661843 has 4 divisors (see below), whose sum is σ = 69995040. Its totient is φ = 65328648.

The previous prime is 67661813. The next prime is 67661861. The reversal of 67661843 is 34816676.

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

It is not a de Polignac number, because 67661843 - 2⁶ = 67661779 is a prime.

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 67661843.

It is not an unprimeable number, because it can be changed into a prime (67661813) 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, 1166555 + ... + 1166612.

It is an arithmetic number, because the mean of its divisors is an integer number (17498760).

Almost surely, 2^67661843 is an apocalyptic number.

67661843 is a deficient number, since it is larger than the sum of its proper divisors (2333197).

67661843 is a wasteful number, since it uses less digits than its factorization.

67661843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333196.

The product of its digits is 145152, while the sum is 41.

The square root of 67661843 is about 8225.6819170206. The cubic root of 67661843 is about 407.4877971931.

The spelling of 67661843 in words is "sixty-seven million, six hundred sixty-one thousand, eight hundred forty-three".