75251081640 has 192 divisors, whose sum is σ = 262886808960. Its totient is φ = 17182179840.

The previous prime is 75251081603. The next prime is 75251081641. The reversal of 75251081640 is 4618015257.

It is not an unprimeable number, because it can be changed into a prime (75251081641) 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 47 ways as a sum of consecutive naturals, for example, 6056074 + ... + 6068486.

It is an arithmetic number, because the mean of its divisors is an integer number (1369202130).

Almost surely, 2^75251081640 is an apocalyptic number.

75251081640 is a gapful number since it is divisible by the number (70) 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 75251081640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131443404480).

75251081640 is an abundant number, since it is smaller than the sum of its proper divisors (187635727320).

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

75251081640 is a wasteful number, since it uses less digits than its factorization.

75251081640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13472 (or 13461 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 39.

Adding to 75251081640 its reverse (4618015257), we get a palindrome (79869096897).

The spelling of 75251081640 in words is "seventy-five billion, two hundred fifty-one million, eighty-one thousand, six hundred forty".