51265720000 has 560 divisors, whose sum is σ = 147628343808. Its totient is φ = 17487360000.

The previous prime is 51265719997. The next prime is 51265720003. The reversal of 51265720000 is 2756215.

It is an interprime number because it is at equal distance from previous prime (51265719997) and next prime (51265720003).

It is not an unprimeable number, because it can be changed into a prime (51265720003) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 765159967 + ... + 765160033.

Almost surely, 2^51265720000 is an apocalyptic number.

51265720000 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 51265720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73814171904).

51265720000 is an abundant number, since it is smaller than the sum of its proper divisors (96362623808).

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

51265720000 is a wasteful number, since it uses less digits than its factorization.

51265720000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The spelling of 51265720000 in words is "fifty-one billion, two hundred sixty-five million, seven hundred twenty thousand".