2105661602 has 12 divisors (see below), whose sum is σ = 3471731718. Its totient is φ = 957118800.

The previous prime is 2105661587. The next prime is 2105661637. The reversal of 2105661602 is 2061665012.

It can be written as a sum of positive squares in only one way, i.e., 1366854841 + 738806761 = 36971^2 + 27181^2 .

It is a super-4 number, since 4×2105661602⁴ (a number of 38 digits) contains 4444 as substring.

It is a hoax number, since the sum of its digits (29) 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 5 ways as a sum of consecutive naturals, for example, 4350299 + ... + 4350782.

Almost surely, 2^2105661602 is an apocalyptic number.

2105661602 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2105661602 is a deficient number, since it is larger than the sum of its proper divisors (1366070116).

2105661602 is a wasteful number, since it uses less digits than its factorization.

2105661602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8701105 (or 8701094 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 2105661602 is about 45887.4885126654. The cubic root of 2105661602 is about 1281.7289465511.

The spelling of 2105661602 in words is "two billion, one hundred five million, six hundred sixty-one thousand, six hundred two".