1641656300121 has 12 divisors (see below), whose sum is σ = 2371295579172. Its totient is φ = 1094430953376.

The previous prime is 1641656300117. The next prime is 1641656300129. The reversal of 1641656300121 is 1210036561461.

1641656300121 is a `hidden beast` number, since 1 + 6 + 4 + 1 + 6 + 5 + 630 + 0 + 12 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1109725299225 + 531931000896 = 1053435^2 + 729336^2 .

It is not a de Polignac number, because 1641656300121 - 2² = 1641656300117 is a prime.

It is a super-2 number, since 2×1641656300121² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1641656300129) 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 11 ways as a sum of consecutive naturals, for example, 1393815 + ... + 2286051.

It is an arithmetic number, because the mean of its divisors is an integer number (197607964931).

Almost surely, 2^{1641656300121} is an apocalyptic number.

It is an amenable number.

1641656300121 is a deficient number, since it is larger than the sum of its proper divisors (729639279051).

1641656300121 is a wasteful number, since it uses less digits than its factorization.

1641656300121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096680 (or 1096677 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 1641656300121 in words is "one trillion, six hundred forty-one billion, six hundred fifty-six million, three hundred thousand, one hundred twenty-one".