6640628505 has 16 divisors (see below), whose sum is σ = 12142863744. Its totient is φ = 3035715840.

The previous prime is 6640628483. The next prime is 6640628521. The reversal of 6640628505 is 5058260466.

It is not a de Polignac number, because 6640628505 - 2⁷ = 6640628377 is a prime.

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, 31621936 + ... + 31622145.

It is an arithmetic number, because the mean of its divisors is an integer number (758928984).

Almost surely, 2^6640628505 is an apocalyptic number.

It is an amenable number.

6640628505 is a deficient number, since it is larger than the sum of its proper divisors (5502235239).

6640628505 is a wasteful number, since it uses less digits than its factorization.

6640628505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63244096.

The product of its (nonzero) digits is 345600, while the sum is 42.

The square root of 6640628505 is about 81490.0515707286. The cubic root of 6640628505 is about 1879.6185759510.

The spelling of 6640628505 in words is "six billion, six hundred forty million, six hundred twenty-eight thousand, five hundred five".