51243320000 has 70 divisors (see below), whose sum is σ = 127066878708. Its totient is φ = 20497312000.

The previous prime is 51243319969. The next prime is 51243320021. The reversal of 51243320000 is 2334215.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 600542 + ... + 680541.

Almost surely, 2^51243320000 is an apocalyptic number.

51243320000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51243320000 is an abundant number, since it is smaller than the sum of its proper divisors (75823558708).

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

51243320000 is an equidigital number, since it uses as much as digits as its factorization.

51243320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281115 (or 1281090 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 51243320000 its reverse (2334215), we get a palindrome (51245654215).

The spelling of 51243320000 in words is "fifty-one billion, two hundred forty-three million, three hundred twenty thousand".