651721028068 has 48 divisors (see below), whose sum is σ = 1261416360960. Its totient is φ = 292137580800.

The previous prime is 651721028053. The next prime is 651721028087. The reversal of 651721028068 is 860820127156.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41558653 + ... + 41574331.

It is an arithmetic number, because the mean of its divisors is an integer number (26279507520).

Almost surely, 2^651721028068 is an apocalyptic number.

It is an amenable number.

651721028068 is a deficient number, since it is larger than the sum of its proper divisors (609695332892).

651721028068 is a wasteful number, since it uses less digits than its factorization.

651721028068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28708 (or 28706 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 651721028068 in words is "six hundred fifty-one billion, seven hundred twenty-one million, twenty-eight thousand, sixty-eight".