75361550821 has 2 divisors, whose sum is σ = 75361550822. Its totient is φ = 75361550820.

The previous prime is 75361550807. The next prime is 75361550837. The reversal of 75361550821 is 12805516357.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70841677921 + 4519872900 = 266161^2 + 67230^2 .

It is a cyclic number.

It is not a de Polignac number, because 75361550821 - 2¹³ = 75361542629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75361550861) 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 as a sum of consecutive naturals, namely, 37680775410 + 37680775411.

It is an arithmetic number, because the mean of its divisors is an integer number (37680775411).

Almost surely, 2^75361550821 is an apocalyptic number.

It is an amenable number.

75361550821 is a deficient number, since it is larger than the sum of its proper divisors (1).

75361550821 is an equidigital number, since it uses as much as digits as its factorization.

75361550821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 75361550821 in words is "seventy-five billion, three hundred sixty-one million, five hundred fifty thousand, eight hundred twenty-one".