145964111981 has 4 divisors (see below), whose sum is σ = 146355437052. Its totient is φ = 145572786912.

The previous prime is 145964111921. The next prime is 145964112011. The reversal of 145964111981 is 189111469541.

145964111981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189111469541 = 19 ⋅9953235239.

It can be written as a sum of positive squares in 2 ways, for example, as 88244049481 + 57720062500 = 297059^2 + 240250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145964111981 is a prime.

It is a super-2 number, since 2×145964111981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145964111921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195661976 + ... + 195662721.

It is an arithmetic number, because the mean of its divisors is an integer number (36588859263).

Almost surely, 2^145964111981 is an apocalyptic number.

It is an amenable number.

145964111981 is a deficient number, since it is larger than the sum of its proper divisors (391325071).

145964111981 is an equidigital number, since it uses as much as digits as its factorization.

145964111981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391325070.

The product of its digits is 311040, while the sum is 50.

The spelling of 145964111981 in words is "one hundred forty-five billion, nine hundred sixty-four million, one hundred eleven thousand, nine hundred eighty-one".