6645665090 has 32 divisors (see below), whose sum is σ = 12294664704. Its totient is φ = 2584491840.

The previous prime is 6645665087. The next prime is 6645665119. The reversal of 6645665090 is 905665466.

It is a happy 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, 553127 + ... + 565013.

It is an arithmetic number, because the mean of its divisors is an integer number (384208272).

Almost surely, 2^6645665090 is an apocalyptic number.

6645665090 is a deficient number, since it is larger than the sum of its proper divisors (5648999614).

6645665090 is a wasteful number, since it uses less digits than its factorization.

6645665090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13442.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The square root of 6645665090 is about 81520.9487800528. The cubic root of 6645665090 is about 1880.0936547957.

The spelling of 6645665090 in words is "six billion, six hundred forty-five million, six hundred sixty-five thousand, ninety".