515551155515 has 16 divisors (see below), whose sum is σ = 683034702336. Its totient is φ = 370428866400.

The previous prime is 515551155473. The next prime is 515551155569.

515551155515 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-515551155515 is a prime.

It is a nude number because it is divisible by every one of its digits.

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, 56463251 + ... + 56472380.

It is an arithmetic number, because the mean of its divisors is an integer number (42689668896).

Almost surely, 2^515551155515 is an apocalyptic number.

515551155515 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

515551155515 is a deficient number, since it is larger than the sum of its proper divisors (167483546821).

515551155515 is a wasteful number, since it uses less digits than its factorization.

515551155515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112935730.

The product of its digits is 390625, while the sum is 44.

The spelling of 515551155515 in words is "five hundred fifteen billion, five hundred fifty-one million, one hundred fifty-five thousand, five hundred fifteen".