75220685545 has 8 divisors (see below), whose sum is σ = 91195388424. Its totient is φ = 59556171264.

The previous prime is 75220685543. The next prime is 75220685549. The reversal of 75220685545 is 54558602257.

It can be written as a sum of positive squares in 4 ways, for example, as 24276132864 + 50944552681 = 155808^2 + 225709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75220685545 - 2¹ = 75220685543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75220685543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77546614 + ... + 77547583.

It is an arithmetic number, because the mean of its divisors is an integer number (11399423553).

Almost surely, 2^75220685545 is an apocalyptic number.

It is an amenable number.

75220685545 is a deficient number, since it is larger than the sum of its proper divisors (15974702879).

75220685545 is a wasteful number, since it uses less digits than its factorization.

75220685545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155094299.

The product of its (nonzero) digits is 3360000, while the sum is 49.

The spelling of 75220685545 in words is "seventy-five billion, two hundred twenty million, six hundred eighty-five thousand, five hundred forty-five".