51551615515 has 16 divisors (see below), whose sum is σ = 62571860640. Its totient is φ = 40768231680.

The previous prime is 51551615513. The next prime is 51551615519.

It is a happy number.

51551615515 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51551615515 - 2¹ = 51551615513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51551615513) 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, 2301520 + ... + 2323810.

It is an arithmetic number, because the mean of its divisors is an integer number (3910741290).

Almost surely, 2^51551615515 is an apocalyptic number.

51551615515 is a deficient number, since it is larger than the sum of its proper divisors (11020245125).

51551615515 is a wasteful number, since it uses less digits than its factorization.

51551615515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27582.

The product of its digits is 93750, while the sum is 40.

The spelling of 51551615515 in words is "fifty-one billion, five hundred fifty-one million, six hundred fifteen thousand, five hundred fifteen".