81847489157487 has 12 divisors (see below), whose sum is σ = 120739558474080. Its totient is φ = 53404035478368.

The previous prime is 81847489157417. The next prime is 81847489157527. The reversal of 81847489157487 is 78475198474818.

81847489157487 is a `hidden beast` number, since 8 + 1 + 8 + 4 + 7 + 4 + 89 + 1 + 57 + 487 = 666.

It is not a de Polignac number, because 81847489157487 - 2²⁸ = 81847220722031 is a prime.

It is a super-2 number, since 2×81847489157487² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81847489157417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96746440662 + ... + 96746441507.

It is an arithmetic number, because the mean of its divisors is an integer number (10061629872840).

Almost surely, 2^{81847489157487} is an apocalyptic number.

81847489157487 is a deficient number, since it is larger than the sum of its proper divisors (38892069316593).

81847489157487 is a wasteful number, since it uses less digits than its factorization.

81847489157487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193492882222 (or 193492882219 counting only the distinct ones).

The product of its digits is 4046192640, while the sum is 81.

The spelling of 81847489157487 in words is "eighty-one trillion, eight hundred forty-seven billion, four hundred eighty-nine million, one hundred fifty-seven thousand, four hundred eighty-seven".