651440112521 has 8 divisors (see below), whose sum is σ = 711767177184. Its totient is φ = 591297253920.

The previous prime is 651440112431. The next prime is 651440112529. The reversal of 651440112521 is 125211044156.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 651440112521 - 2¹⁸ = 651439850377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651440112529) 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, 46044116 + ... + 46058261.

It is an arithmetic number, because the mean of its divisors is an integer number (88970897148).

Almost surely, 2^651440112521 is an apocalyptic number.

It is an amenable number.

651440112521 is a deficient number, since it is larger than the sum of its proper divisors (60327064663).

651440112521 is a wasteful number, since it uses less digits than its factorization.

651440112521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92103031.

The product of its (nonzero) digits is 9600, while the sum is 32.

Adding to 651440112521 its reverse (125211044156), we get a palindrome (776651156677).

The spelling of 651440112521 in words is "six hundred fifty-one billion, four hundred forty million, one hundred twelve thousand, five hundred twenty-one".