1611666212 has 72 divisors (see below), whose sum is σ = 3254891640. Its totient is φ = 693665280.

The previous prime is 1611666197. The next prime is 1611666263. The reversal of 1611666212 is 2126661161.

It can be written as a sum of positive squares in 4 ways, for example, as 185395456 + 1426270756 = 13616^2 + 37766^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1127114 + ... + 1128542.

Almost surely, 2^1611666212 is an apocalyptic number.

It is an amenable number.

1611666212 is an abundant number, since it is smaller than the sum of its proper divisors (1643225428).

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

1611666212 is a wasteful number, since it uses less digits than its factorization.

1611666212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533 (or 1508 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 1611666212 is about 40145.5627934147. The cubic root of 1611666212 is about 1172.4428983395.

It can be divided in two parts, 16116 and 66212, that added together give a palindrome (82328).

The spelling of 1611666212 in words is "one billion, six hundred eleven million, six hundred sixty-six thousand, two hundred twelve".