766257225566 has 16 divisors (see below), whose sum is σ = 1315614099456. Its totient is φ = 327888382776.

The previous prime is 766257225563. The next prime is 766257225583. The reversal of 766257225566 is 665522752667.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766257225563) 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, 42288206 + ... + 42306321.

It is an arithmetic number, because the mean of its divisors is an integer number (82225881216).

Almost surely, 2^766257225566 is an apocalyptic number.

766257225566 is a deficient number, since it is larger than the sum of its proper divisors (549356873890).

766257225566 is a wasteful number, since it uses less digits than its factorization.

766257225566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84595183.

The product of its digits is 63504000, while the sum is 59.

The spelling of 766257225566 in words is "seven hundred sixty-six billion, two hundred fifty-seven million, two hundred twenty-five thousand, five hundred sixty-six".