6135721157 has 4 divisors (see below), whose sum is σ = 6135904896. Its totient is φ = 6135537420.

The previous prime is 6135721147. The next prime is 6135721169. The reversal of 6135721157 is 7511275316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6135721157 - 2³⁰ = 5061979333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6135721157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6135721147) 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, 26069 + ... + 113802.

It is an arithmetic number, because the mean of its divisors is an integer number (1533976224).

Almost surely, 2^6135721157 is an apocalyptic number.

It is an amenable number.

6135721157 is a deficient number, since it is larger than the sum of its proper divisors (183739).

6135721157 is a wasteful number, since it uses less digits than its factorization.

6135721157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183738.

The product of its digits is 44100, while the sum is 38.

The square root of 6135721157 is about 78330.8442249922. The cubic root of 6135721157 is about 1830.7197699175.

The spelling of 6135721157 in words is "six billion, one hundred thirty-five million, seven hundred twenty-one thousand, one hundred fifty-seven".