6720507155 has 4 divisors (see below), whose sum is σ = 8064608592. Its totient is φ = 5376405720.

The previous prime is 6720507151. The next prime is 6720507187. The reversal of 6720507155 is 5517050276.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6720507155 - 2² = 6720507151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6720507151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 672050711 + ... + 672050720.

It is an arithmetic number, because the mean of its divisors is an integer number (2016152148).

Almost surely, 2^6720507155 is an apocalyptic number.

6720507155 is a deficient number, since it is larger than the sum of its proper divisors (1344101437).

6720507155 is a wasteful number, since it uses less digits than its factorization.

6720507155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344101436.

The product of its (nonzero) digits is 73500, while the sum is 38.

The square root of 6720507155 is about 81978.6993980754. The cubic root of 6720507155 is about 1887.1250631961.

The spelling of 6720507155 in words is "six billion, seven hundred twenty million, five hundred seven thousand, one hundred fifty-five".