6516121153 has 4 divisors (see below), whose sum is σ = 6519075840. Its totient is φ = 6513166468.

The previous prime is 6516121123. The next prime is 6516121159. The reversal of 6516121153 is 3511216156.

It is a happy number.

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 6516121153 - 2⁵ = 6516121121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6516121159) 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, 1474033 + ... + 1478446.

It is an arithmetic number, because the mean of its divisors is an integer number (1629768960).

Almost surely, 2^6516121153 is an apocalyptic number.

It is an amenable number.

6516121153 is a deficient number, since it is larger than the sum of its proper divisors (2954687).

6516121153 is a wasteful number, since it uses less digits than its factorization.

6516121153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2954686.

The product of its digits is 5400, while the sum is 31.

The square root of 6516121153 is about 80722.4947149182. The cubic root of 6516121153 is about 1867.7971862497.

The spelling of 6516121153 in words is "six billion, five hundred sixteen million, one hundred twenty-one thousand, one hundred fifty-three".