75681027761 has 2 divisors, whose sum is σ = 75681027762. Its totient is φ = 75681027760.

The previous prime is 75681027749. The next prime is 75681027797. The reversal of 75681027761 is 16772018657.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63060752161 + 12620275600 = 251119^2 + 112340^2 .

It is a cyclic number.

It is not a de Polignac number, because 75681027761 - 2¹⁰ = 75681026737 is a prime.

It is a super-2 number, since 2×75681027761² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (75681027061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37840513880 + 37840513881.

It is an arithmetic number, because the mean of its divisors is an integer number (37840513881).

Almost surely, 2^75681027761 is an apocalyptic number.

It is an amenable number.

75681027761 is a deficient number, since it is larger than the sum of its proper divisors (1).

75681027761 is an equidigital number, since it uses as much as digits as its factorization.

75681027761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 987840, while the sum is 50.

The spelling of 75681027761 in words is "seventy-five billion, six hundred eighty-one million, twenty-seven thousand, seven hundred sixty-one".