6651503165 has 4 divisors (see below), whose sum is σ = 7981803804. Its totient is φ = 5321202528.

The previous prime is 6651503149. The next prime is 6651503179. The reversal of 6651503165 is 5613051566.

6651503165 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1132053316 + 5519449849 = 33646^2 + 74293^2 .

It is a cyclic number.

It is not a de Polignac number, because 6651503165 - 2⁴ = 6651503149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665150312 + ... + 665150321.

It is an arithmetic number, because the mean of its divisors is an integer number (1995450951).

Almost surely, 2^6651503165 is an apocalyptic number.

It is an amenable number.

6651503165 is a deficient number, since it is larger than the sum of its proper divisors (1330300639).

6651503165 is a wasteful number, since it uses less digits than its factorization.

6651503165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330300638.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 6651503165 is about 81556.7481266878. The cubic root of 6651503165 is about 1880.6440343832.

The spelling of 6651503165 in words is "six billion, six hundred fifty-one million, five hundred three thousand, one hundred sixty-five".