67969191501649 has 3 divisors (see below), whose sum is σ = 67969199745993. Its totient is φ = 67969183257306.

The previous prime is 67969191501569. The next prime is 67969191501703. The reversal of 67969191501649 is 94610519196976.

The square root of 67969191501649 is 8244343.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 67969191501649 - 2³⁷ = 67831752548177 is a prime.

It is a super-3 number, since 3×67969191501649³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67969191511649) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4122172 + ... + 12366514.

It is an arithmetic number, because the mean of its divisors is an integer number (22656399915331).

Almost surely, 2^{67969191501649} is an apocalyptic number.

67969191501649 is the 8244343-rd square number.

67969191501649 is the 4122172-nd centered octagonal number.

It is an amenable number.

67969191501649 is a deficient number, since it is larger than the sum of its proper divisors (8244344).

67969191501649 is an frugal number, since it uses more digits than its factorization.

67969191501649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16488686 (or 8244343 counting only the distinct ones).

The product of its (nonzero) digits is 198404640, while the sum is 73.

The spelling of 67969191501649 in words is "sixty-seven trillion, nine hundred sixty-nine billion, one hundred ninety-one million, five hundred one thousand, six hundred forty-nine".