6721127156 has 24 divisors (see below), whose sum is σ = 11819593800. Its totient is φ = 3344140800.

The previous prime is 6721127141. The next prime is 6721127197. The reversal of 6721127156 is 6517211276.

It can be written as a sum of positive squares in 4 ways, for example, as 3089136400 + 3631990756 = 55580^2 + 60266^2 .

It is a congruent number.

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, 722696 + ... + 731936.

It is an arithmetic number, because the mean of its divisors is an integer number (492483075).

Almost surely, 2^6721127156 is an apocalyptic number.

It is an amenable number.

6721127156 is a deficient number, since it is larger than the sum of its proper divisors (5098466644).

6721127156 is a wasteful number, since it uses less digits than its factorization.

6721127156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10115 (or 10113 counting only the distinct ones).

The product of its digits is 35280, while the sum is 38.

The square root of 6721127156 is about 81982.4807870560. The cubic root of 6721127156 is about 1887.1830937099.

The spelling of 6721127156 in words is "six billion, seven hundred twenty-one million, one hundred twenty-seven thousand, one hundred fifty-six".