51385206699 has 6 divisors (see below), whose sum is σ = 74223076356. Its totient is φ = 34256804460.

The previous prime is 51385206671. The next prime is 51385206707. The reversal of 51385206699 is 99660258315.

It is a happy number.

51385206699 is a `hidden beast` number, since 51 + 3 + 8 + 520 + 6 + 69 + 9 = 666.

It is not a de Polignac number, because 51385206699 - 2⁵ = 51385206667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51385206599) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2854733697 + ... + 2854733714.

It is an arithmetic number, because the mean of its divisors is an integer number (12370512726).

Almost surely, 2^51385206699 is an apocalyptic number.

51385206699 is a deficient number, since it is larger than the sum of its proper divisors (22837869657).

51385206699 is a wasteful number, since it uses less digits than its factorization.

51385206699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5709467417 (or 5709467414 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 51385206699 in words is "fifty-one billion, three hundred eighty-five million, two hundred six thousand, six hundred ninety-nine".