51664341515 has 4 divisors (see below), whose sum is σ = 61997209824. Its totient is φ = 41331473208.

The previous prime is 51664341497. The next prime is 51664341517. The reversal of 51664341515 is 51514346615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51664341515 - 2¹⁰ = 51664340491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51664341517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5166434147 + ... + 5166434156.

It is an arithmetic number, because the mean of its divisors is an integer number (15499302456).

Almost surely, 2^51664341515 is an apocalyptic number.

51664341515 is a deficient number, since it is larger than the sum of its proper divisors (10332868309).

51664341515 is a wasteful number, since it uses less digits than its factorization.

51664341515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10332868308.

The product of its digits is 216000, while the sum is 41.

The spelling of 51664341515 in words is "fifty-one billion, six hundred sixty-four million, three hundred forty-one thousand, five hundred fifteen".