51626664139 has 4 divisors (see below), whose sum is σ = 53021979424. Its totient is φ = 50231348856.

The previous prime is 51626664137. The next prime is 51626664143. The reversal of 51626664139 is 93146662615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93146662615 = 5 ⋅18629332523.

It is a cyclic number.

It is not a de Polignac number, because 51626664139 - 2¹ = 51626664137 is a prime.

It is a super-2 number, since 2×51626664139² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51626664092 and 51626664101.

It is not an unprimeable number, because it can be changed into a prime (51626664137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697657587 + ... + 697657660.

It is an arithmetic number, because the mean of its divisors is an integer number (13255494856).

Almost surely, 2^51626664139 is an apocalyptic number.

51626664139 is a deficient number, since it is larger than the sum of its proper divisors (1395315285).

51626664139 is a wasteful number, since it uses less digits than its factorization.

51626664139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395315284.

The product of its digits is 1399680, while the sum is 49.

The spelling of 51626664139 in words is "fifty-one billion, six hundred twenty-six million, six hundred sixty-four thousand, one hundred thirty-nine".