720661155 has 8 divisors (see below), whose sum is σ = 1153057872. Its totient is φ = 384352608.

The previous prime is 720661133. The next prime is 720661163. The reversal of 720661155 is 551166027.

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

It is not a de Polignac number, because 720661155 - 2¹⁸ = 720399011 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24022024 + ... + 24022053.

It is an arithmetic number, because the mean of its divisors is an integer number (144132234).

Almost surely, 2^720661155 is an apocalyptic number.

720661155 is a deficient number, since it is larger than the sum of its proper divisors (432396717).

720661155 is a wasteful number, since it uses less digits than its factorization.

720661155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48044085.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 720661155 is about 26845.1327990755. The cubic root of 720661155 is about 896.5552082653. Note that the first 3 decimals are identical.

The spelling of 720661155 in words is "seven hundred twenty million, six hundred sixty-one thousand, one hundred fifty-five".