3156570221666 has 8 divisors (see below), whose sum is σ = 4735009619280. Its totient is φ = 1578233681908.

The previous prime is 3156570221657. The next prime is 3156570221671. The reversal of 3156570221666 is 6661220756513.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25637696 + ... + 25760523.

It is an arithmetic number, because the mean of its divisors is an integer number (591876202410).

Almost surely, 2^{3156570221666} is an apocalyptic number.

3156570221666 is a deficient number, since it is larger than the sum of its proper divisors (1578439397614).

3156570221666 is a wasteful number, since it uses less digits than its factorization.

3156570221666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51428928.

The product of its (nonzero) digits is 2721600, while the sum is 50.

The spelling of 3156570221666 in words is "three trillion, one hundred fifty-six billion, five hundred seventy million, two hundred twenty-one thousand, six hundred sixty-six".