37205772201666 has 12 divisors (see below), whose sum is σ = 80612506436982. Its totient is φ = 12401924067216.

The previous prime is 37205772201649. The next prime is 37205772201671. The reversal of 37205772201666 is 66610227750273.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 37160667362025 + 45104839641 = 6095955^2 + 212379^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1033493672251 + ... + 1033493672286.

Almost surely, 2^{37205772201666} is an apocalyptic number.

37205772201666 is an abundant number, since it is smaller than the sum of its proper divisors (43406734235316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

37205772201666 is a wasteful number, since it uses less digits than its factorization.

37205772201666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066987344545 (or 2066987344542 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 54.

The spelling of 37205772201666 in words is "thirty-seven trillion, two hundred five billion, seven hundred seventy-two million, two hundred one thousand, six hundred sixty-six".