51720022000 has 80 divisors (see below), whose sum is σ = 127720075392. Its totient is φ = 20247801600.

The previous prime is 51720021967. The next prime is 51720022019. The reversal of 51720022000 is 22002715.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181107 + ... + 369106.

Almost surely, 2^51720022000 is an apocalyptic number.

51720022000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51720022000 is an abundant number, since it is smaller than the sum of its proper divisors (76000053392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51720022000 is a wasteful number, since it uses less digits than its factorization.

51720022000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550283 (or 550267 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

Adding to 51720022000 its reverse (22002715), we get a palindrome (51742024715).

The spelling of 51720022000 in words is "fifty-one billion, seven hundred twenty million, twenty-two thousand".