51866680319 has 4 divisors (see below), whose sum is σ = 52640809944. Its totient is φ = 51092550696.

The previous prime is 51866680291. The next prime is 51866680337. The reversal of 51866680319 is 91308666815.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51866680319 is a prime.

It is a super-2 number, since 2×51866680319² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51866680819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387064712 + ... + 387064845.

It is an arithmetic number, because the mean of its divisors is an integer number (13160202486).

Almost surely, 2^51866680319 is an apocalyptic number.

51866680319 is a deficient number, since it is larger than the sum of its proper divisors (774129625).

51866680319 is an equidigital number, since it uses as much as digits as its factorization.

51866680319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774129624.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 51866680319 in words is "fifty-one billion, eight hundred sixty-six million, six hundred eighty thousand, three hundred nineteen".