51510720651 has 16 divisors (see below), whose sum is σ = 74011042560. Its totient is φ = 31678791840.

The previous prime is 51510720649. The next prime is 51510720761. The reversal of 51510720651 is 15602701515.

It is a happy number.

It is not a de Polignac number, because 51510720651 - 2¹ = 51510720649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51510720601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356655 + ... + 479816.

It is an arithmetic number, because the mean of its divisors is an integer number (4625690160).

Almost surely, 2^51510720651 is an apocalyptic number.

51510720651 is a deficient number, since it is larger than the sum of its proper divisors (22500321909).

51510720651 is a wasteful number, since it uses less digits than its factorization.

51510720651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838066.

The product of its (nonzero) digits is 10500, while the sum is 33.

The spelling of 51510720651 in words is "fifty-one billion, five hundred ten million, seven hundred twenty thousand, six hundred fifty-one".