45009905991 has 8 divisors (see below), whose sum is σ = 60360105840. Its totient is φ = 29833155072.

The previous prime is 45009905929. The next prime is 45009906013. The reversal of 45009905991 is 19950990054.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 45009905991 - 2¹⁰ = 45009904967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45009905791) 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 7 ways as a sum of consecutive naturals, for example, 43361626 + ... + 43362663.

It is an arithmetic number, because the mean of its divisors is an integer number (7545013230).

Almost surely, 2^45009905991 is an apocalyptic number.

45009905991 is a deficient number, since it is larger than the sum of its proper divisors (15350199849).

45009905991 is a wasteful number, since it uses less digits than its factorization.

45009905991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86724465.

The product of its (nonzero) digits is 656100, while the sum is 51.

The spelling of 45009905991 in words is "forty-five billion, nine million, nine hundred five thousand, nine hundred ninety-one".