75251081641 has 2 divisors, whose sum is σ = 75251081642. Its totient is φ = 75251081640.

The previous prime is 75251081603. The next prime is 75251081681. The reversal of 75251081641 is 14618015257.

It is an a-pointer prime, because the next prime (75251081681) can be obtained adding 75251081641 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64498221225 + 10752860416 = 253965^2 + 103696^2 .

It is a cyclic number.

It is not a de Polignac number, because 75251081641 - 2¹⁷ = 75250950569 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 75251081594 and 75251081603.

It is not a weakly prime, because it can be changed into another prime (75251081681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37625540820 + 37625540821.

It is an arithmetic number, because the mean of its divisors is an integer number (37625540821).

Almost surely, 2^75251081641 is an apocalyptic number.

It is an amenable number.

75251081641 is a deficient number, since it is larger than the sum of its proper divisors (1).

75251081641 is an equidigital number, since it uses as much as digits as its factorization.

75251081641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 40.

Adding to 75251081641 its reverse (14618015257), we get a palindrome (89869096898).

The spelling of 75251081641 in words is "seventy-five billion, two hundred fifty-one million, eighty-one thousand, six hundred forty-one".