120945641681 has 2 divisors, whose sum is σ = 120945641682. Its totient is φ = 120945641680.

The previous prime is 120945641671. The next prime is 120945641717. The reversal of 120945641681 is 186146549021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109087520656 + 11858121025 = 330284^2 + 108895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120945641681 is a prime.

It is a super-2 number, since 2×120945641681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (120945641671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60472820840 + 60472820841.

It is an arithmetic number, because the mean of its divisors is an integer number (60472820841).

Almost surely, 2^120945641681 is an apocalyptic number.

It is an amenable number.

120945641681 is a deficient number, since it is larger than the sum of its proper divisors (1).

120945641681 is an equidigital number, since it uses as much as digits as its factorization.

120945641681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 120945641681 in words is "one hundred twenty billion, nine hundred forty-five million, six hundred forty-one thousand, six hundred eighty-one".