75661133 has 2 divisors, whose sum is σ = 75661134. Its totient is φ = 75661132.

The previous prime is 75661129. The next prime is 75661153. The reversal of 75661133 is 33116657.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75655204 + 5929 = 8698^2 + 77^2 .

It is a cyclic number.

It is not a de Polignac number, because 75661133 - 2² = 75661129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75661133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75661153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37830566 + 37830567.

It is an arithmetic number, because the mean of its divisors is an integer number (37830567).

Almost surely, 2^75661133 is an apocalyptic number.

It is an amenable number.

75661133 is a deficient number, since it is larger than the sum of its proper divisors (1).

75661133 is an equidigital number, since it uses as much as digits as its factorization.

75661133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 32.

The square root of 75661133 is about 8698.3408187999. The cubic root of 75661133 is about 422.9518674263.

The spelling of 75661133 in words is "seventy-five million, six hundred sixty-one thousand, one hundred thirty-three".