75755945981 has 2 divisors, whose sum is σ = 75755945982. Its totient is φ = 75755945980.

The previous prime is 75755945957. The next prime is 75755946043. The reversal of 75755945981 is 18954955757.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73785029956 + 1970916025 = 271634^2 + 44395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75755945981 is a prime.

It is a super-2 number, since 2×75755945981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75755941981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37877972990 + 37877972991.

It is an arithmetic number, because the mean of its divisors is an integer number (37877972991).

Almost surely, 2^75755945981 is an apocalyptic number.

It is an amenable number.

75755945981 is a deficient number, since it is larger than the sum of its proper divisors (1).

75755945981 is an equidigital number, since it uses as much as digits as its factorization.

75755945981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380000, while the sum is 65.

The spelling of 75755945981 in words is "seventy-five billion, seven hundred fifty-five million, nine hundred forty-five thousand, nine hundred eighty-one".