51651397700 has 72 divisors (see below), whose sum is σ = 128252541312. Its totient is φ = 17687335680.

The previous prime is 51651397673. The next prime is 51651397709. The reversal of 51651397700 is 779315615.

It is not an unprimeable number, because it can be changed into a prime (51651397709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 531272 + ... + 620928.

It is an arithmetic number, because the mean of its divisors is an integer number (1781285296).

Almost surely, 2^51651397700 is an apocalyptic number.

51651397700 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51651397700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64126270656).

51651397700 is an abundant number, since it is smaller than the sum of its proper divisors (76601143612).

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

51651397700 is a wasteful number, since it uses less digits than its factorization.

51651397700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90501 (or 90494 counting only the distinct ones).

The product of its (nonzero) digits is 198450, while the sum is 44.

The spelling of 51651397700 in words is "fifty-one billion, six hundred fifty-one million, three hundred ninety-seven thousand, seven hundred".