75087381661 has 2 divisors, whose sum is σ = 75087381662. Its totient is φ = 75087381660.

The previous prime is 75087381623. The next prime is 75087381709. The reversal of 75087381661 is 16618378057.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53791524900 + 21295856761 = 231930^2 + 145931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75087381661 is a prime.

It is a super-2 number, since 2×75087381661² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 75087381599 and 75087381608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75087381361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37543690830 + 37543690831.

It is an arithmetic number, because the mean of its divisors is an integer number (37543690831).

Almost surely, 2^75087381661 is an apocalyptic number.

It is an amenable number.

75087381661 is a deficient number, since it is larger than the sum of its proper divisors (1).

75087381661 is an equidigital number, since it uses as much as digits as its factorization.

75087381661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 75087381661 in words is "seventy-five billion, eighty-seven million, three hundred eighty-one thousand, six hundred sixty-one".