3625786666 has 4 divisors (see below), whose sum is σ = 5438680002. Its totient is φ = 1812893332.

The previous prime is 3625786651. The next prime is 3625786687. The reversal of 3625786666 is 6666875263.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6666875263 = 32839 ⋅203017.

It can be written as a sum of positive squares in only one way, i.e., 2882079225 + 743707441 = 53685^2 + 27271^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906446665 + ... + 906446668.

Almost surely, 2^3625786666 is an apocalyptic number.

3625786666 is a deficient number, since it is larger than the sum of its proper divisors (1812893336).

3625786666 is a wasteful number, since it uses less digits than its factorization.

3625786666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812893335.

The product of its digits is 13063680, while the sum is 55.

The square root of 3625786666 is about 60214.5054451168. The cubic root of 3625786666 is about 1536.2695260557.

The spelling of 3625786666 in words is "three billion, six hundred twenty-five million, seven hundred eighty-six thousand, six hundred sixty-six".