75556669 has 2 divisors, whose sum is σ = 75556670. Its totient is φ = 75556668.

The previous prime is 75556667. The next prime is 75556681. The reversal of 75556669 is 96665557.

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., 69939769 + 5616900 = 8363^2 + 2370^2 .

It is an emirp because it is prime and its reverse (96665557) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75556669 - 2¹ = 75556667 is a prime.

It is a super-2 number, since 2×75556669² = 11417620460751122, which contains 22 as substring.

Together with 75556667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75556661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37778334 + 37778335.

It is an arithmetic number, because the mean of its divisors is an integer number (37778335).

Almost surely, 2^75556669 is an apocalyptic number.

It is an amenable number.

75556669 is a deficient number, since it is larger than the sum of its proper divisors (1).

75556669 is an equidigital number, since it uses as much as digits as its factorization.

75556669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1701000, while the sum is 49.

The square root of 75556669 is about 8692.3339213355. Note that the first 3 decimals coincide. The cubic root of 75556669 is about 422.7571236960.

The spelling of 75556669 in words is "seventy-five million, five hundred fifty-six thousand, six hundred sixty-nine".