75247004621 has 2 divisors, whose sum is σ = 75247004622. Its totient is φ = 75247004620.

The previous prime is 75247004551. The next prime is 75247004639. The reversal of 75247004621 is 12640074257.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74919901225 + 327103396 = 273715^2 + 18086^2 .

It is a cyclic number.

It is not a de Polignac number, because 75247004621 - 2³⁰ = 74173262797 is a prime.

It is a super-2 number, since 2×75247004621² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75247004641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37623502310 + 37623502311.

It is an arithmetic number, because the mean of its divisors is an integer number (37623502311).

Almost surely, 2^75247004621 is an apocalyptic number.

It is an amenable number.

75247004621 is a deficient number, since it is larger than the sum of its proper divisors (1).

75247004621 is an equidigital number, since it uses as much as digits as its factorization.

75247004621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94080, while the sum is 38.

Adding to 75247004621 its reverse (12640074257), we get a palindrome (87887078878).

The spelling of 75247004621 in words is "seventy-five billion, two hundred forty-seven million, four thousand, six hundred twenty-one".