67028668991 has 4 divisors (see below), whose sum is σ = 67080670800. Its totient is φ = 66976667184.

The previous prime is 67028668961. The next prime is 67028669017. The reversal of 67028668991 is 19986682076.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67028668991 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 (67028668921) 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, 25998971 + ... + 26001548.

It is an arithmetic number, because the mean of its divisors is an integer number (16770167700).

Almost surely, 2^67028668991 is an apocalyptic number.

67028668991 is a deficient number, since it is larger than the sum of its proper divisors (52001809).

67028668991 is a wasteful number, since it uses less digits than its factorization.

67028668991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52001808.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 67028668991 in words is "sixty-seven billion, twenty-eight million, six hundred sixty-eight thousand, nine hundred ninety-one".