51012651561 has 8 divisors (see below), whose sum is σ = 68473358400. Its totient is φ = 33780189552.

The previous prime is 51012651559. The next prime is 51012651563. The reversal of 51012651561 is 16515621015.

It is an interprime number because it is at equal distance from previous prime (51012651559) and next prime (51012651563).

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

It is not a de Polignac number, because 51012651561 - 2¹ = 51012651559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51012651563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57060685 + ... + 57061578.

It is an arithmetic number, because the mean of its divisors is an integer number (8559169800).

Almost surely, 2^51012651561 is an apocalyptic number.

It is an amenable number.

51012651561 is a deficient number, since it is larger than the sum of its proper divisors (17460706839).

51012651561 is a wasteful number, since it uses less digits than its factorization.

51012651561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114122415.

The product of its (nonzero) digits is 9000, while the sum is 33.

The spelling of 51012651561 in words is "fifty-one billion, twelve million, six hundred fifty-one thousand, five hundred sixty-one".