57220001666 has 16 divisors (see below), whose sum is σ = 86093710488. Its totient is φ = 28522137600.

The previous prime is 57220001653. The next prime is 57220001681. The reversal of 57220001666 is 66610002275.

It can be written as a sum of positive squares in 4 ways, for example, as 52156967641 + 5063034025 = 228379^2 + 71155^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4314806 + ... + 4328046.

Almost surely, 2^57220001666 is an apocalyptic number.

57220001666 is a deficient number, since it is larger than the sum of its proper divisors (28873708822).

57220001666 is a wasteful number, since it uses less digits than its factorization.

57220001666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19717.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 57220001666 in words is "fifty-seven billion, two hundred twenty million, one thousand, six hundred sixty-six".