75738229921 has 2 divisors, whose sum is σ = 75738229922. Its totient is φ = 75738229920.

The previous prime is 75738229877. The next prime is 75738229997. The reversal of 75738229921 is 12992283757.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67026621025 + 8711608896 = 258895^2 + 93336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75738229921 is a prime.

It is not a weakly prime, because it can be changed into another prime (75738223921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37869114960 + 37869114961.

It is an arithmetic number, because the mean of its divisors is an integer number (37869114961).

Almost surely, 2^75738229921 is an apocalyptic number.

It is an amenable number.

75738229921 is a deficient number, since it is larger than the sum of its proper divisors (1).

75738229921 is an equidigital number, since it uses as much as digits as its factorization.

75738229921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 55.

The spelling of 75738229921 in words is "seventy-five billion, seven hundred thirty-eight million, two hundred twenty-nine thousand, nine hundred twenty-one".