1627688666 has 16 divisors (see below), whose sum is σ = 2552202240. Its totient is φ = 777619440.

The previous prime is 1627688653. The next prime is 1627688669. The reversal of 1627688666 is 6668867261.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1627688669) 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 in 7 ways as a sum of consecutive naturals, for example, 161261 + ... + 171056.

It is an arithmetic number, because the mean of its divisors is an integer number (159512640).

Almost surely, 2^1627688666 is an apocalyptic number.

1627688666 is a deficient number, since it is larger than the sum of its proper divisors (924513574).

1627688666 is a wasteful number, since it uses less digits than its factorization.

1627688666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332429.

The product of its digits is 6967296, while the sum is 56.

The square root of 1627688666 is about 40344.6237558364. The cubic root of 1627688666 is about 1176.3153920798.

The spelling of 1627688666 in words is "one billion, six hundred twenty-seven million, six hundred eighty-eight thousand, six hundred sixty-six".