51664498515 has 48 divisors (see below), whose sum is σ = 106135481088. Its totient is φ = 23618052576.

The previous prime is 51664498477. The next prime is 51664498517. The reversal of 51664498515 is 51589446615.

It is a happy number.

51664498515 is a `hidden beast` number, since 51 + 66 + 449 + 85 + 15 = 666.

It is not a de Polignac number, because 51664498515 - 2¹³ = 51664490323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51664498517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3028797 + ... + 3045806.

It is an arithmetic number, because the mean of its divisors is an integer number (2211155856).

Almost surely, 2^51664498515 is an apocalyptic number.

51664498515 is an abundant number, since it is smaller than the sum of its proper divisors (54470982573).

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

51664498515 is an equidigital number, since it uses as much as digits as its factorization.

51664498515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6074630 (or 6074618 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 54.

The spelling of 51664498515 in words is "fifty-one billion, six hundred sixty-four million, four hundred ninety-eight thousand, five hundred fifteen".