75052921781 has 2 divisors, whose sum is σ = 75052921782. Its totient is φ = 75052921780.

The previous prime is 75052921759. The next prime is 75052921789. The reversal of 75052921781 is 18712925057.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44085721156 + 30967200625 = 209966^2 + 175975^2 .

It is a cyclic number.

It is not a de Polignac number, because 75052921781 - 2¹⁰ = 75052920757 is a prime.

It is a super-2 number, since 2×75052921781² (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 (75052921789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37526460890 + 37526460891.

It is an arithmetic number, because the mean of its divisors is an integer number (37526460891).

Almost surely, 2^75052921781 is an apocalyptic number.

It is an amenable number.

75052921781 is a deficient number, since it is larger than the sum of its proper divisors (1).

75052921781 is an equidigital number, since it uses as much as digits as its factorization.

75052921781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 352800, while the sum is 47.

The spelling of 75052921781 in words is "seventy-five billion, fifty-two million, nine hundred twenty-one thousand, seven hundred eighty-one".