81848553537 has 8 divisors (see below), whose sum is σ = 110256471136. Its totient is φ = 54003169152.

The previous prime is 81848553529. The next prime is 81848553547. The reversal of 81848553537 is 73535584818.

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

It is not a de Polignac number, because 81848553537 - 2³ = 81848553529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81848553547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140632963 + ... + 140633544.

It is an arithmetic number, because the mean of its divisors is an integer number (13782058892).

Almost surely, 2^81848553537 is an apocalyptic number.

It is an amenable number.

81848553537 is a deficient number, since it is larger than the sum of its proper divisors (28407917599).

81848553537 is a wasteful number, since it uses less digits than its factorization.

81848553537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281266607.

The product of its digits is 16128000, while the sum is 57.

The spelling of 81848553537 in words is "eighty-one billion, eight hundred forty-eight million, five hundred fifty-three thousand, five hundred thirty-seven".