6640570072 has 32 divisors (see below), whose sum is σ = 13111257600. Its totient is φ = 3144364704.

The previous prime is 6640570067. The next prime is 6640570081. The reversal of 6640570072 is 2700750466.

It is a super-2 number, since 2×6640570072² = 88194341762284170368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511453 + ... + 524275.

It is an arithmetic number, because the mean of its divisors is an integer number (409726800).

Almost surely, 2^6640570072 is an apocalyptic number.

It is an amenable number.

6640570072 is a deficient number, since it is larger than the sum of its proper divisors (6470687528).

6640570072 is a wasteful number, since it uses less digits than its factorization.

6640570072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16255 (or 16251 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 6640570072 is about 81489.6930415129. The cubic root of 6640570072 is about 1879.6130628145.

The spelling of 6640570072 in words is "six billion, six hundred forty million, five hundred seventy thousand, seventy-two".