6651781992 has 32 divisors (see below), whose sum is σ = 18477172800. Its totient is φ = 2217260592.

The previous prime is 6651781987. The next prime is 6651782017. The reversal of 6651781992 is 2991871566.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 15397428 + ... + 15397859.

It is an arithmetic number, because the mean of its divisors is an integer number (577411650).

Almost surely, 2^6651781992 is an apocalyptic number.

It is an amenable number.

6651781992 is an abundant number, since it is smaller than the sum of its proper divisors (11825390808).

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

6651781992 is a wasteful number, since it uses less digits than its factorization.

6651781992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30795302 (or 30795292 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 6651781992 is about 81558.4575136141. The cubic root of 6651781992 is about 1880.6703125038.

The spelling of 6651781992 in words is "six billion, six hundred fifty-one million, seven hundred eighty-one thousand, nine hundred ninety-two".