6501290665 has 16 divisors (see below), whose sum is σ = 7998673536. Its totient is φ = 5069833600.

The previous prime is 6501290647. The next prime is 6501290687. The reversal of 6501290665 is 5660921056.

6501290665 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6501290665 - 2¹¹ = 6501288617 is a prime.

It is a super-2 number, since 2×6501290665² = 84533560621632284450, which contains 22 as substring.

It is a Duffinian 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, 237750 + ... + 263680.

It is an arithmetic number, because the mean of its divisors is an integer number (499917096).

Almost surely, 2^6501290665 is an apocalyptic number.

It is an amenable number.

6501290665 is a deficient number, since it is larger than the sum of its proper divisors (1497382871).

6501290665 is a wasteful number, since it uses less digits than its factorization.

6501290665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27200.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 6501290665 is about 80630.5814502165. The cubic root of 6501290665 is about 1866.3790938623.

The spelling of 6501290665 in words is "six billion, five hundred one million, two hundred ninety thousand, six hundred sixty-five".