651106061521 has 4 divisors (see below), whose sum is σ = 661779931444. Its totient is φ = 640432191600.

The previous prime is 651106061497. The next prime is 651106061579. The reversal of 651106061521 is 125160601156.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115252781121 + 535853280400 = 339489^2 + 732020^2 .

It is a cyclic number.

It is not a de Polignac number, because 651106061521 - 2¹⁵ = 651106028753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651106061591) 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 3 ways as a sum of consecutive naturals, for example, 5336934870 + ... + 5336934991.

It is an arithmetic number, because the mean of its divisors is an integer number (165444982861).

Almost surely, 2^651106061521 is an apocalyptic number.

651106061521 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

651106061521 is a deficient number, since it is larger than the sum of its proper divisors (10673869923).

651106061521 is a wasteful number, since it uses less digits than its factorization.

651106061521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10673869922.

The product of its (nonzero) digits is 10800, while the sum is 34.

Adding to 651106061521 its reverse (125160601156), we get a palindrome (776266662677).

The spelling of 651106061521 in words is "six hundred fifty-one billion, one hundred six million, sixty-one thousand, five hundred twenty-one".