67712354621 has 4 divisors (see below), whose sum is σ = 67737169500. Its totient is φ = 67687539744.

The previous prime is 67712354599. The next prime is 67712354639. The reversal of 67712354621 is 12645321776.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28759411396 + 38952943225 = 169586^2 + 197365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67712354621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67712350621) 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, 12403346 + ... + 12408803.

It is an arithmetic number, because the mean of its divisors is an integer number (16934292375).

Almost surely, 2^67712354621 is an apocalyptic number.

It is an amenable number.

67712354621 is a deficient number, since it is larger than the sum of its proper divisors (24814879).

67712354621 is a wasteful number, since it uses less digits than its factorization.

67712354621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24814878.

The product of its digits is 423360, while the sum is 44.

The spelling of 67712354621 in words is "sixty-seven billion, seven hundred twelve million, three hundred fifty-four thousand, six hundred twenty-one".