47581820218845 has 40 divisors (see below), whose sum is σ = 93048892881120. Its totient is φ = 23069973437280.

The previous prime is 47581820218843. The next prime is 47581820218861. The reversal of 47581820218845 is 54881202818574.

It is a happy number.

47581820218845 is a `hidden beast` number, since 4 + 7 + 581 + 8 + 2 + 0 + 2 + 1 + 8 + 8 + 45 = 666.

It is not a de Polignac number, because 47581820218845 - 2¹ = 47581820218843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47581820218841) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5340267175 + ... + 5340276084.

It is an arithmetic number, because the mean of its divisors is an integer number (2326222322028).

Almost surely, 2^{47581820218845} is an apocalyptic number.

47581820218845 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

47581820218845 is a deficient number, since it is larger than the sum of its proper divisors (45467072662275).

47581820218845 is a wasteful number, since it uses less digits than its factorization.

47581820218845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10680543287 (or 10680543278 counting only the distinct ones).

The product of its (nonzero) digits is 45875200, while the sum is 63.

The spelling of 47581820218845 in words is "forty-seven trillion, five hundred eighty-one billion, eight hundred twenty million, two hundred eighteen thousand, eight hundred forty-five".