651053720641 has 9 divisors (see below), whose sum is σ = 654048802659. Its totient is φ = 648072302736.

The previous prime is 651053720579. The next prime is 651053720659. The reversal of 651053720641 is 146027350156.

The square root of 651053720641 is 806879.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 132215868225 + 518837852416 = 363615^2 + 720304^2 .

It is not a de Polignac number, because 651053720641 - 2²⁹ = 650516849729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 651053720594 and 651053720603.

It is not an unprimeable number, because it can be changed into a prime (651053720741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 188001076 + ... + 188004538.

Almost surely, 2^651053720641 is an apocalyptic number.

651053720641 is the 806879-th square number.

651053720641 is the 403440-th centered octagonal number.

It is an amenable number.

651053720641 is a deficient number, since it is larger than the sum of its proper divisors (2995082018).

651053720641 is an frugal number, since it uses more digits than its factorization.

651053720641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7392 (or 3696 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 651053720641 in words is "six hundred fifty-one billion, fifty-three million, seven hundred twenty thousand, six hundred forty-one".