75771921289 has 9 divisors (see below), whose sum is σ = 76873990791. Its totient is φ = 74685442440.

The previous prime is 75771921241. The next prime is 75771921293. The reversal of 75771921289 is 98212917757.

The square root of 75771921289 is 275267.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 19266828025 + 56505093264 = 138805^2 + 237708^2 .

It is not a de Polignac number, because 75771921289 - 2²⁵ = 75738366857 is a prime.

It is a super-2 number, since 2×75771921289² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75771921299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19542019 + ... + 19545895.

Almost surely, 2^75771921289 is an apocalyptic number.

75771921289 is the 275267-th square number.

75771921289 is the 137634-th centered octagonal number.

It is an amenable number.

75771921289 is a deficient number, since it is larger than the sum of its proper divisors (1102069502).

75771921289 is an frugal number, since it uses more digits than its factorization.

75771921289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7896 (or 3948 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 58.

The spelling of 75771921289 in words is "seventy-five billion, seven hundred seventy-one million, nine hundred twenty-one thousand, two hundred eighty-nine".