43951440645 has 128 divisors (see below), whose sum is σ = 92923822080. Its totient is φ = 19292532480.

The previous prime is 43951440641. The next prime is 43951440647. The reversal of 43951440645 is 54604415934.

43951440645 is a `hidden beast` number, since 4 + 39 + 514 + 40 + 64 + 5 = 666.

43951440645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43951440645 - 2² = 43951440641 is a prime.

It is a super-3 number, since 3×43951440645³ (a number of 33 digits) contains 333 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 43951440645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43951440641) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2344660 + ... + 2363330.

It is an arithmetic number, because the mean of its divisors is an integer number (725967360).

Almost surely, 2^43951440645 is an apocalyptic number.

43951440645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

43951440645 is an abundant number, since it is smaller than the sum of its proper divisors (48972381435).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43951440645 is a wasteful number, since it uses less digits than its factorization.

43951440645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18792 (or 18786 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 43951440645 in words is "forty-three billion, nine hundred fifty-one million, four hundred forty thousand, six hundred forty-five".