1646642556100 has 18 divisors (see below), whose sum is σ = 3573214346954. Its totient is φ = 658657022400.

The previous prime is 1646642556089. The next prime is 1646642556107. The reversal of 1646642556100 is 16552466461.

It can be written as a sum of positive squares in 3 ways, for example, as 12970020996 + 1633672535104 = 113886^2 + 1278152^2 .

It is a super-2 number, since 2×1646642556100² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1646642556107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8233212681 + ... + 8233212880.

Almost surely, 2^{1646642556100} is an apocalyptic number.

1646642556100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646642556100 is an abundant number, since it is smaller than the sum of its proper divisors (1926571790854).

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

1646642556100 is a wasteful number, since it uses less digits than its factorization.

1646642556100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16466425575 (or 16466425568 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 1646642556100 in words is "one trillion, six hundred forty-six billion, six hundred forty-two million, five hundred fifty-six thousand, one hundred".