51699623512 has 8 divisors (see below), whose sum is σ = 96936794100. Its totient is φ = 25849811752.

The previous prime is 51699623453. The next prime is 51699623519. The reversal of 51699623512 is 21532699615.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51699623519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3231226462 + ... + 3231226477.

Almost surely, 2^51699623512 is an apocalyptic number.

It is an amenable number.

51699623512 is a deficient number, since it is larger than the sum of its proper divisors (45237170588).

51699623512 is a wasteful number, since it uses less digits than its factorization.

51699623512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462452945 (or 6462452941 counting only the distinct ones).

The product of its digits is 874800, while the sum is 49.

The spelling of 51699623512 in words is "fifty-one billion, six hundred ninety-nine million, six hundred twenty-three thousand, five hundred twelve".