651255503121 has 12 divisors (see below), whose sum is σ = 946139981748. Its totient is φ = 431660679264.

The previous prime is 651255503117. The next prime is 651255503159. The reversal of 651255503121 is 121305552156.

651255503121 is a `hidden beast` number, since 6 + 5 + 1 + 25 + 5 + 503 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 564842433600 + 86413069521 = 751560^2 + 293961^2 .

It is not a de Polignac number, because 651255503121 - 2² = 651255503117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (651255503161) 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 11 ways as a sum of consecutive naturals, for example, 209136370 + ... + 209139483.

It is an arithmetic number, because the mean of its divisors is an integer number (78844998479).

Almost surely, 2^651255503121 is an apocalyptic number.

It is an amenable number.

651255503121 is a deficient number, since it is larger than the sum of its proper divisors (294884478627).

651255503121 is a wasteful number, since it uses less digits than its factorization.

651255503121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418276032 (or 418276029 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 651255503121 in words is "six hundred fifty-one billion, two hundred fifty-five million, five hundred three thousand, one hundred twenty-one".