67721531410609 has 4 divisors (see below), whose sum is σ = 67754042949616. Its totient is φ = 67689019871604.

The previous prime is 67721531410601. The next prime is 67721531410613. The reversal of 67721531410609 is 90601413512776.

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 a cyclic number.

It is not a de Polignac number, because 67721531410609 - 2³ = 67721531410601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67721531410601) 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, 16255766379 + ... + 16255770544.

It is an arithmetic number, because the mean of its divisors is an integer number (16938510737404).

Almost surely, 2^{67721531410609} is an apocalyptic number.

It is an amenable number.

67721531410609 is a deficient number, since it is larger than the sum of its proper divisors (32511539007).

67721531410609 is a wasteful number, since it uses less digits than its factorization.

67721531410609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32511539006.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 67721531410609 in words is "sixty-seven trillion, seven hundred twenty-one billion, five hundred thirty-one million, four hundred ten thousand, six hundred nine".