51333071997 has 4 divisors (see below), whose sum is σ = 68444096000. Its totient is φ = 34222047996.

The previous prime is 51333071971. The next prime is 51333072017. The reversal of 51333071997 is 79917033315.

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 51333071997 - 2²² = 51328877693 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 (51333071927) 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, 8555511997 + ... + 8555512002.

It is an arithmetic number, because the mean of its divisors is an integer number (17111024000).

Almost surely, 2^51333071997 is an apocalyptic number.

It is an amenable number.

51333071997 is a deficient number, since it is larger than the sum of its proper divisors (17111024003).

51333071997 is a wasteful number, since it uses less digits than its factorization.

51333071997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17111024002.

The product of its (nonzero) digits is 535815, while the sum is 48.

The spelling of 51333071997 in words is "fifty-one billion, three hundred thirty-three million, seventy-one thousand, nine hundred ninety-seven".