145405661441 has 4 divisors (see below), whose sum is σ = 146467016772. Its totient is φ = 144344306112.

The previous prime is 145405661413. The next prime is 145405661501. The reversal of 145405661441 is 144166504541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64374345841 + 81031315600 = 253721^2 + 284660^2 .

It is a cyclic number.

It is not a de Polignac number, because 145405661441 - 2⁶ = 145405661377 is a prime.

It is a super-3 number, since 3×145405661441³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145405661741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530677460 + ... + 530677733.

It is an arithmetic number, because the mean of its divisors is an integer number (36616754193).

Almost surely, 2^145405661441 is an apocalyptic number.

It is an amenable number.

145405661441 is a deficient number, since it is larger than the sum of its proper divisors (1061355331).

145405661441 is a wasteful number, since it uses less digits than its factorization.

145405661441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061355330.

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 145405661441 in words is "one hundred forty-five billion, four hundred five million, six hundred sixty-one thousand, four hundred forty-one".