1641252203666 has 8 divisors (see below), whose sum is σ = 2461925576844. Its totient is φ = 820610344720.

The previous prime is 1641252203653. The next prime is 1641252203681. The reversal of 1641252203666 is 6663022521461.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1632698728441 + 8553475225 = 1277771^2 + 92485^2 .

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

It is a super-2 number, since 2×1641252203666² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7747925 + ... + 7956936.

Almost surely, 2^{1641252203666} is an apocalyptic number.

1641252203666 is a deficient number, since it is larger than the sum of its proper divisors (820673373178).

1641252203666 is a wasteful number, since it uses less digits than its factorization.

1641252203666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15757116.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 1641252203666 in words is "one trillion, six hundred forty-one billion, two hundred fifty-two million, two hundred three thousand, six hundred sixty-six".