51015156505 has 8 divisors (see below), whose sum is σ = 61219820232. Its totient is φ = 40811036928.

The previous prime is 51015156497. The next prime is 51015156529. The reversal of 51015156505 is 50565151015.

51015156505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 116186841 + 50898969664 = 10779^2 + 225608^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51015156505 - 2³ = 51015156497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111009 + ... + 338161.

It is an arithmetic number, because the mean of its divisors is an integer number (7652477529).

Almost surely, 2^51015156505 is an apocalyptic number.

It is an amenable number.

51015156505 is a deficient number, since it is larger than the sum of its proper divisors (10204663727).

51015156505 is a wasteful number, since it uses less digits than its factorization.

51015156505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272075.

The product of its (nonzero) digits is 18750, while the sum is 34.

The spelling of 51015156505 in words is "fifty-one billion, fifteen million, one hundred fifty-six thousand, five hundred five".