51140356639 has 2 divisors, whose sum is σ = 51140356640. Its totient is φ = 51140356638.

The previous prime is 51140356621. The next prime is 51140356649. The reversal of 51140356639 is 93665304115.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51140356639 - 2¹⁹ = 51139832351 is a prime.

It is a super-2 number, since 2×51140356639² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51140356595 and 51140356604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51140356609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25570178319 + 25570178320.

It is an arithmetic number, because the mean of its divisors is an integer number (25570178320).

Almost surely, 2^51140356639 is an apocalyptic number.

51140356639 is a deficient number, since it is larger than the sum of its proper divisors (1).

51140356639 is an equidigital number, since it uses as much as digits as its factorization.

51140356639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 43.

The spelling of 51140356639 in words is "fifty-one billion, one hundred forty million, three hundred fifty-six thousand, six hundred thirty-nine".