6630721572 has 24 divisors (see below), whose sum is σ = 15613628800. Its totient is φ = 2189962656.

The previous prime is 6630721541. The next prime is 6630721583. The reversal of 6630721572 is 2751270366.

It is a self number, because there is not a number n which added to its sum of digits gives 6630721572.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2533372 + ... + 2535987.

Almost surely, 2^6630721572 is an apocalyptic number.

It is an amenable number.

6630721572 is an abundant number, since it is smaller than the sum of its proper divisors (8982907228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6630721572 is a wasteful number, since it uses less digits than its factorization.

6630721572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5069475 (or 5069473 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 6630721572 is about 81429.2427325712. The cubic root of 6630721572 is about 1878.6833972447.

The spelling of 6630721572 in words is "six billion, six hundred thirty million, seven hundred twenty-one thousand, five hundred seventy-two".