51973394997 has 4 divisors (see below), whose sum is σ = 69297860000. Its totient is φ = 34648929996.

The previous prime is 51973394989. The next prime is 51973395091. The reversal of 51973394997 is 79949337915.

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 51973394997 - 2³ = 51973394989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51973394797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8662232497 + ... + 8662232502.

It is an arithmetic number, because the mean of its divisors is an integer number (17324465000).

Almost surely, 2^51973394997 is an apocalyptic number.

It is an amenable number.

51973394997 is a deficient number, since it is larger than the sum of its proper divisors (17324465003).

51973394997 is a wasteful number, since it uses less digits than its factorization.

51973394997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17324465002.

The product of its digits is 57868020, while the sum is 66.

The spelling of 51973394997 in words is "fifty-one billion, nine hundred seventy-three million, three hundred ninety-four thousand, nine hundred ninety-seven".