51268091520 has 256 divisors, whose sum is σ = 165821644800. Its totient is φ = 13471911936.

The previous prime is 51268091509. The next prime is 51268091521. The reversal of 51268091520 is 2519086215.

It is a super-3 number, since 3×51268091520³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51268091521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40720651 + ... + 40721909.

It is an arithmetic number, because the mean of its divisors is an integer number (647740800).

Almost surely, 2^51268091520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51268091520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82910822400).

51268091520 is an abundant number, since it is smaller than the sum of its proper divisors (114553553280).

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

51268091520 is a wasteful number, since it uses less digits than its factorization.

51268091520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575 (or 1563 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The spelling of 51268091520 in words is "fifty-one billion, two hundred sixty-eight million, ninety-one thousand, five hundred twenty".