77225566 has 16 divisors (see below), whose sum is σ = 126592128. Its totient is φ = 35040600.

The previous prime is 77225563. The next prime is 77225597. The reversal of 77225566 is 66552277.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77225563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11101 + ... + 16663.

It is an arithmetic number, because the mean of its divisors is an integer number (7912008).

Almost surely, 2^77225566 is an apocalyptic number.

77225566 is a deficient number, since it is larger than the sum of its proper divisors (49366562).

77225566 is a wasteful number, since it uses less digits than its factorization.

77225566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6207.

The product of its digits is 176400, while the sum is 40.

The square root of 77225566 is about 8787.8078039975. The cubic root of 77225566 is about 425.8471058216.

Subtracting from 77225566 its reverse (66552277), we obtain a square (10673289 = 3267²).

The spelling of 77225566 in words is "seventy-seven million, two hundred twenty-five thousand, five hundred sixty-six".