43820065491 has 16 divisors (see below), whose sum is σ = 59312901888. Its totient is φ = 28771181600.

The previous prime is 43820065483. The next prime is 43820065501. The reversal of 43820065491 is 19456002834.

It is a cyclic number.

It is not a de Polignac number, because 43820065491 - 2³ = 43820065483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43820265491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91120 + ... + 309746.

It is an arithmetic number, because the mean of its divisors is an integer number (3707056368).

Almost surely, 2^43820065491 is an apocalyptic number.

43820065491 is a deficient number, since it is larger than the sum of its proper divisors (15492836397).

43820065491 is a wasteful number, since it uses less digits than its factorization.

43820065491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219642.

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 43820065491 in words is "forty-three billion, eight hundred twenty million, sixty-five thousand, four hundred ninety-one".