6115721011 has 4 divisors (see below), whose sum is σ = 6129845512. Its totient is φ = 6101596512.

The previous prime is 6115720991. The next prime is 6115721023. The reversal of 6115721011 is 1101275116.

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

It is a cyclic number.

It is not a de Polignac number, because 6115721011 - 2⁵ = 6115720979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6115721041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7061601 + ... + 7062466.

It is an arithmetic number, because the mean of its divisors is an integer number (1532461378).

Almost surely, 2^6115721011 is an apocalyptic number.

6115721011 is a deficient number, since it is larger than the sum of its proper divisors (14124501).

6115721011 is a wasteful number, since it uses less digits than its factorization.

6115721011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14124500.

The product of its (nonzero) digits is 420, while the sum is 25.

The square root of 6115721011 is about 78203.0754574269. The cubic root of 6115721011 is about 1828.7284517934.

Adding to 6115721011 its reverse (1101275116), we get a palindrome (7216996127).

The spelling of 6115721011 in words is "six billion, one hundred fifteen million, seven hundred twenty-one thousand, eleven".