8523847947981 has 16 divisors (see below), whose sum is σ = 11426206405824. Its totient is φ = 5652092719104.

The previous prime is 8523847947949. The next prime is 8523847948027. The reversal of 8523847947981 is 1897497483258.

It is not a de Polignac number, because 8523847947981 - 2⁵ = 8523847947949 is a prime.

It is a super-2 number, since 2×8523847947981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8523847947911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7643155 + ... + 8687088.

It is an arithmetic number, because the mean of its divisors is an integer number (714137900364).

Almost surely, 2^{8523847947981} is an apocalyptic number.

It is an amenable number.

8523847947981 is a deficient number, since it is larger than the sum of its proper divisors (2902358457843).

8523847947981 is a wasteful number, since it uses less digits than its factorization.

8523847947981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16331180.

The product of its digits is 975421440, while the sum is 75.

The spelling of 8523847947981 in words is "eight trillion, five hundred twenty-three billion, eight hundred forty-seven million, nine hundred forty-seven thousand, nine hundred eighty-one".