720720506155 has 16 divisors (see below), whose sum is σ = 940097267424. Its totient is φ = 527250309120.

The previous prime is 720720506153. The next prime is 720720506159. The reversal of 720720506155 is 551605027027.

It is not a de Polignac number, because 720720506155 - 2¹ = 720720506153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720720506153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51806166 + ... + 51820075.

It is an arithmetic number, because the mean of its divisors is an integer number (58756079214).

Almost surely, 2^720720506155 is an apocalyptic number.

720720506155 is a deficient number, since it is larger than the sum of its proper divisors (219376761269).

720720506155 is a wasteful number, since it uses less digits than its factorization.

720720506155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103626366.

The product of its (nonzero) digits is 147000, while the sum is 40.

The spelling of 720720506155 in words is "seven hundred twenty billion, seven hundred twenty million, five hundred six thousand, one hundred fifty-five".