651660051065 has 8 divisors (see below), whose sum is σ = 782109499848. Its totient is φ = 521249748480.

The previous prime is 651660051061. The next prime is 651660051089. The reversal of 651660051065 is 560150066156.

It can be written as a sum of positive squares in 4 ways, for example, as 202798910224 + 448861140841 = 450332^2 + 669971^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 651660051065 - 2² = 651660051061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651660051061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9749912 + ... + 9816521.

It is an arithmetic number, because the mean of its divisors is an integer number (97763687481).

Almost surely, 2^651660051065 is an apocalyptic number.

It is an amenable number.

651660051065 is a deficient number, since it is larger than the sum of its proper divisors (130449448783).

651660051065 is a wasteful number, since it uses less digits than its factorization.

651660051065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19573099.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 651660051065 in words is "six hundred fifty-one billion, six hundred sixty million, fifty-one thousand, sixty-five".