51868252909 has 16 divisors (see below), whose sum is σ = 56918442240. Its totient is φ = 46874520000.

The previous prime is 51868252861. The next prime is 51868252927. The reversal of 51868252909 is 90925286815.

It is not a de Polignac number, because 51868252909 - 2¹³ = 51868244717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51868252909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51868252979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1649484 + ... + 1680634.

It is an arithmetic number, because the mean of its divisors is an integer number (3557402640).

Almost surely, 2^51868252909 is an apocalyptic number.

It is an amenable number.

51868252909 is a deficient number, since it is larger than the sum of its proper divisors (5050189331).

51868252909 is a wasteful number, since it uses less digits than its factorization.

51868252909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32052.

The product of its (nonzero) digits is 3110400, while the sum is 55.

The spelling of 51868252909 in words is "fifty-one billion, eight hundred sixty-eight million, two hundred fifty-two thousand, nine hundred nine".