43661338425 has 36 divisors (see below), whose sum is σ = 82802451420. Its totient is φ = 21916277760.

The previous prime is 43661338423. The next prime is 43661338447. The reversal of 43661338425 is 52483316634.

43661338425 is a `hidden beast` number, since 4 + 3 + 6 + 613 + 3 + 8 + 4 + 25 = 666.

43661338425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 2366627904 + 41294710521 = 48648^2 + 203211^2 .

It is not a de Polignac number, because 43661338425 - 2¹ = 43661338423 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43661338423) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5703540 + ... + 5711189.

It is an arithmetic number, because the mean of its divisors is an integer number (2300068095).

Almost surely, 2^43661338425 is an apocalyptic number.

43661338425 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

43661338425 is a deficient number, since it is larger than the sum of its proper divisors (39141112995).

43661338425 is a wasteful number, since it uses less digits than its factorization.

43661338425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11414762 (or 11414754 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The spelling of 43661338425 in words is "forty-three billion, six hundred sixty-one million, three hundred thirty-eight thousand, four hundred twenty-five".