51005514515 has 4 divisors (see below), whose sum is σ = 61206617424. Its totient is φ = 40804411608.

The previous prime is 51005514431. The next prime is 51005514517. The reversal of 51005514515 is 51541550015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51541550015 = 5 ⋅10308310003.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51005514515 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51005514517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5100551447 + ... + 5100551456.

It is an arithmetic number, because the mean of its divisors is an integer number (15301654356).

Almost surely, 2^51005514515 is an apocalyptic number.

51005514515 is a deficient number, since it is larger than the sum of its proper divisors (10201102909).

51005514515 is a wasteful number, since it uses less digits than its factorization.

51005514515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10201102908.

The product of its (nonzero) digits is 12500, while the sum is 32.

The spelling of 51005514515 in words is "fifty-one billion, five million, five hundred fourteen thousand, five hundred fifteen".