75221284861 has 4 divisors (see below), whose sum is σ = 77815122300. Its totient is φ = 72627447424.

The previous prime is 75221284849. The next prime is 75221284889. The reversal of 75221284861 is 16848212257.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16848212257 = 409 ⋅41193673.

It can be written as a sum of positive squares in 2 ways, for example, as 23941682361 + 51279602500 = 154731^2 + 226450^2 .

It is a cyclic number.

It is not a de Polignac number, because 75221284861 - 2²⁹ = 74684413949 is a prime.

It is a super-2 number, since 2×75221284861² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75221284841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1296918676 + ... + 1296918733.

It is an arithmetic number, because the mean of its divisors is an integer number (19453780575).

Almost surely, 2^75221284861 is an apocalyptic number.

It is an amenable number.

75221284861 is a deficient number, since it is larger than the sum of its proper divisors (2593837439).

75221284861 is a wasteful number, since it uses less digits than its factorization.

75221284861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593837438.

The product of its digits is 430080, while the sum is 46.

The spelling of 75221284861 in words is "seventy-five billion, two hundred twenty-one million, two hundred eighty-four thousand, eight hundred sixty-one".