75181990565 has 12 divisors (see below), whose sum is σ = 99165667692. Its totient is φ = 54677810880.

The previous prime is 75181990553. The next prime is 75181990573. The reversal of 75181990565 is 56509918157.

It can be written as a sum of positive squares in 2 ways, for example, as 15344024641 + 59837965924 = 123871^2 + 244618^2 .

It is not a de Polignac number, because 75181990565 - 2⁶ = 75181990501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75181990565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62133272 + ... + 62134481.

It is an arithmetic number, because the mean of its divisors is an integer number (8263805641).

Almost surely, 2^75181990565 is an apocalyptic number.

It is an amenable number.

75181990565 is a deficient number, since it is larger than the sum of its proper divisors (23983677127).

75181990565 is a wasteful number, since it uses less digits than its factorization.

75181990565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124267780 (or 124267769 counting only the distinct ones).

The product of its (nonzero) digits is 3402000, while the sum is 56.

The spelling of 75181990565 in words is "seventy-five billion, one hundred eighty-one million, nine hundred ninety thousand, five hundred sixty-five".