51693983409 has 4 divisors (see below), whose sum is σ = 68925311216. Its totient is φ = 34462655604.

The previous prime is 51693983399. The next prime is 51693983413. The reversal of 51693983409 is 90438939615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51693983409 - 2⁸ = 51693983153 is a prime.

It is a super-2 number, since 2×51693983409² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51693983609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8615663899 + ... + 8615663904.

It is an arithmetic number, because the mean of its divisors is an integer number (17231327804).

Almost surely, 2^51693983409 is an apocalyptic number.

It is an amenable number.

51693983409 is a deficient number, since it is larger than the sum of its proper divisors (17231327807).

51693983409 is a wasteful number, since it uses less digits than its factorization.

51693983409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17231327806.

The product of its (nonzero) digits is 6298560, while the sum is 57.

The spelling of 51693983409 in words is "fifty-one billion, six hundred ninety-three million, nine hundred eighty-three thousand, four hundred nine".