720661515655 has 8 divisors (see below), whose sum is σ = 864799092432. Its totient is φ = 576525696768.

The previous prime is 720661515653. The next prime is 720661515659. The reversal of 720661515655 is 556515166027.

It is a happy number.

720661515655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 720661515655 - 2¹ = 720661515653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 720661515599 and 720661515608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720661515653) 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, 760119 + ... + 1420951.

It is an arithmetic number, because the mean of its divisors is an integer number (108099886554).

Almost surely, 2^720661515655 is an apocalyptic number.

720661515655 is a deficient number, since it is larger than the sum of its proper divisors (144137576777).

720661515655 is a wasteful number, since it uses less digits than its factorization.

720661515655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878945.

The product of its (nonzero) digits is 1890000, while the sum is 49.

The spelling of 720661515655 in words is "seven hundred twenty billion, six hundred sixty-one million, five hundred fifteen thousand, six hundred fifty-five".