2012020045681 has 2 divisors, whose sum is σ = 2012020045682. Its totient is φ = 2012020045680.

The previous prime is 2012020045649. The next prime is 2012020045687. The reversal of 2012020045681 is 1865400202102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1975104187456 + 36915858225 = 1405384^2 + 192135^2 .

It is a cyclic number.

It is not a de Polignac number, because 2012020045681 - 2⁵ = 2012020045649 is a prime.

It is a super-2 number, since 2×2012020045681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2012020045687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006010022840 + 1006010022841.

It is an arithmetic number, because the mean of its divisors is an integer number (1006010022841).

Almost surely, 2^{2012020045681} is an apocalyptic number.

It is an amenable number.

2012020045681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2012020045681 is an equidigital number, since it uses as much as digits as its factorization.

2012020045681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 2012020045681 its reverse (1865400202102), we get a palindrome (3877420247783).

The spelling of 2012020045681 in words is "two trillion, twelve billion, twenty million, forty-five thousand, six hundred eighty-one".