6135721155 has 48 divisors (see below), whose sum is σ = 11185274880. Its totient is φ = 3105393984.

The previous prime is 6135721147. The next prime is 6135721169. The reversal of 6135721155 is 5511275316.

It is a happy number.

6135721155 is a `hidden beast` number, since 613 + 5 + 7 + 21 + 15 + 5 = 666.

It is not a de Polignac number, because 6135721155 - 2³ = 6135721147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108106 + ... + 154784.

It is an arithmetic number, because the mean of its divisors is an integer number (233026560).

Almost surely, 2^6135721155 is an apocalyptic number.

6135721155 is a deficient number, since it is larger than the sum of its proper divisors (5049553725).

6135721155 is a wasteful number, since it uses less digits than its factorization.

6135721155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46840 (or 46837 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 6135721155 is about 78330.8442122259. The cubic root of 6135721155 is about 1830.7197697185.

The spelling of 6135721155 in words is "six billion, one hundred thirty-five million, seven hundred twenty-one thousand, one hundred fifty-five".