75544171609 has 3 divisors (see below), whose sum is σ = 75544446463. Its totient is φ = 75543896756.

The previous prime is 75544171561. The next prime is 75544171649. The reversal of 75544171609 is 90617144557.

The square root of 75544171609 is 274853.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90617144557 = 132409 ⋅684373.

It can be written as a sum of positive squares in only one way, i.e., 343175625 + 75200995984 = 18525^2 + 274228^2 .

It is not a de Polignac number, because 75544171609 - 2⁹ = 75544171097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75544171649) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 137427 + ... + 412279.

Almost surely, 2^75544171609 is an apocalyptic number.

75544171609 is the 274853-rd square number.

75544171609 is the 137427-th centered octagonal number.

It is an amenable number.

75544171609 is a deficient number, since it is larger than the sum of its proper divisors (274854).

75544171609 is an frugal number, since it uses more digits than its factorization.

75544171609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549706 (or 274853 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 49.

Multiplying 75544171609 by its sum of digits (49), we get a square (3701664408841 = 1923971²).

The spelling of 75544171609 in words is "seventy-five billion, five hundred forty-four million, one hundred seventy-one thousand, six hundred nine".