720961646623 has 8 divisors (see below), whose sum is σ = 722545430400. Its totient is φ = 719378191488.

The previous prime is 720961646621. The next prime is 720961646663. The reversal of 720961646623 is 326646169027.

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 720961646623 - 2¹ = 720961646621 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 (720961646621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4602315 + ... + 4756387.

It is an arithmetic number, because the mean of its divisors is an integer number (90318178800).

Almost surely, 2^720961646623 is an apocalyptic number.

720961646623 is a deficient number, since it is larger than the sum of its proper divisors (1583783777).

720961646623 is a wasteful number, since it uses less digits than its factorization.

720961646623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164321.

The product of its (nonzero) digits is 3919104, while the sum is 52.

The spelling of 720961646623 in words is "seven hundred twenty billion, nine hundred sixty-one million, six hundred forty-six thousand, six hundred twenty-three".