75247304621 has 2 divisors, whose sum is σ = 75247304622. Its totient is φ = 75247304620.

The previous prime is 75247304609. The next prime is 75247304707. The reversal of 75247304621 is 12640374257.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68817028900 + 6430275721 = 262330^2 + 80189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75247304621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75247004621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37623652310 + 37623652311.

It is an arithmetic number, because the mean of its divisors is an integer number (37623652311).

Almost surely, 2^75247304621 is an apocalyptic number.

It is an amenable number.

75247304621 is a deficient number, since it is larger than the sum of its proper divisors (1).

75247304621 is an equidigital number, since it uses as much as digits as its factorization.

75247304621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 41.

Adding to 75247304621 its reverse (12640374257), we get a palindrome (87887678878).

The spelling of 75247304621 in words is "seventy-five billion, two hundred forty-seven million, three hundred four thousand, six hundred twenty-one".