51661500150065 has 16 divisors (see below), whose sum is σ = 66863556446736. Its totient is φ = 38092315219200.

The previous prime is 51661500150059. The next prime is 51661500150119. The reversal of 51661500150065 is 56005100516615.

It can be written as a sum of positive squares in 8 ways, for example, as 2075792259121 + 49585707890944 = 1440761^2 + 7041712^2 .

It is not a de Polignac number, because 51661500150065 - 2²⁰ = 51661499101489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 601161506 + ... + 601247435.

It is an arithmetic number, because the mean of its divisors is an integer number (4178972277921).

Almost surely, 2^{51661500150065} is an apocalyptic number.

It is an amenable number.

51661500150065 is a deficient number, since it is larger than the sum of its proper divisors (15202056296671).

51661500150065 is a wasteful number, since it uses less digits than its factorization.

51661500150065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202409620.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 51661500150065 in words is "fifty-one trillion, six hundred sixty-one billion, five hundred million, one hundred fifty thousand, sixty-five".