721664136453241 has 8 divisors (see below), whose sum is σ = 769947906698784. Its totient is φ = 674028470506560.

The previous prime is 721664136453149. The next prime is 721664136453287. The reversal of 721664136453241 is 142354631466127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 721664136453241 - 2¹⁵ = 721664136420473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721664136463241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162026072415 + ... + 162026076868.

It is an arithmetic number, because the mean of its divisors is an integer number (96243488337348).

Almost surely, 2^{721664136453241} is an apocalyptic number.

It is an amenable number.

721664136453241 is a deficient number, since it is larger than the sum of its proper divisors (48283770245543).

721664136453241 is a wasteful number, since it uses less digits than its factorization.

721664136453241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324052149431.

The product of its digits is 17418240, while the sum is 55.

The spelling of 721664136453241 in words is "seven hundred twenty-one trillion, six hundred sixty-four billion, one hundred thirty-six million, four hundred fifty-three thousand, two hundred forty-one".