6651810005 has 16 divisors (see below), whose sum is σ = 8171676144. Its totient is φ = 5196556800.

The previous prime is 6651809993. The next prime is 6651810047. The reversal of 6651810005 is 5000181566.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 398321764 + 6253488241 = 19958^2 + 79079^2 .

It is not a de Polignac number, because 6651810005 - 2¹⁶ = 6651744469 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 15 ways as a sum of consecutive naturals, for example, 53354 + ... + 127083.

It is an arithmetic number, because the mean of its divisors is an integer number (510729759).

Almost surely, 2^6651810005 is an apocalyptic number.

It is an amenable number.

6651810005 is a deficient number, since it is larger than the sum of its proper divisors (1519866139).

6651810005 is a wasteful number, since it uses less digits than its factorization.

6651810005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180616.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 6651810005 is about 81558.6292491481. The cubic root of 6651810005 is about 1880.6729525554.

The spelling of 6651810005 in words is "six billion, six hundred fifty-one million, eight hundred ten thousand, five".