5151661515 has 288 divisors, whose sum is σ = 12450791808. Its totient is φ = 1916006400.

The previous prime is 5151661481. The next prime is 5151661519.

It is a happy number.

5151661515 is a `hidden beast` number, since 5 + 15 + 16 + 615 + 15 = 666.

5151661515 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 5151661515 - 2¹⁰ = 5151660491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5151661515.

It is not an unprimeable number, because it can be changed into a prime (5151661519) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 18333175 + ... + 18333455.

It is an arithmetic number, because the mean of its divisors is an integer number (43231916).

Almost surely, 2^5151661515 is an apocalyptic number.

5151661515 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

5151661515 is an abundant number, since it is smaller than the sum of its proper divisors (7299130293).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5151661515 is a wasteful number, since it uses less digits than its factorization.

5151661515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 357 counting only the distinct ones).

The product of its digits is 22500, while the sum is 36.

The square root of 5151661515 is about 71775.0758620289. The cubic root of 5151661515 is about 1727.0931968584.

It can be divided in two parts, 5151 and 661515, that added together give a palindrome (666666).

The spelling of 5151661515 in words is "five billion, one hundred fifty-one million, six hundred sixty-one thousand, five hundred fifteen".