6509557972 has 12 divisors (see below), whose sum is σ = 11535926080. Its totient is φ = 3213579096.

The previous prime is 6509557949. The next prime is 6509557981. The reversal of 6509557972 is 2797559056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10299618 + ... + 10300249.

Almost surely, 2^6509557972 is an apocalyptic number.

It is an amenable number.

6509557972 is a deficient number, since it is larger than the sum of its proper divisors (5026368108).

6509557972 is a wasteful number, since it uses less digits than its factorization.

6509557972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20599950 (or 20599948 counting only the distinct ones).

The product of its (nonzero) digits is 5953500, while the sum is 55.

The square root of 6509557972 is about 80681.8317342882. The cubic root of 6509557972 is about 1867.1698800777.

The spelling of 6509557972 in words is "six billion, five hundred nine million, five hundred fifty-seven thousand, nine hundred seventy-two".