81548206874 has 16 divisors (see below), whose sum is σ = 124094488320. Its totient is φ = 40183834320.

The previous prime is 81548206871. The next prime is 81548206877. The reversal of 81548206874 is 47860284518.

It is an interprime number because it is at equal distance from previous prime (81548206871) and next prime (81548206877).

It is a super-2 number, since 2×81548206874² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81548206871) 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, 248192 + ... + 474020.

It is an arithmetic number, because the mean of its divisors is an integer number (7755905520).

Almost surely, 2^81548206874 is an apocalyptic number.

81548206874 is a deficient number, since it is larger than the sum of its proper divisors (42546281446).

81548206874 is a wasteful number, since it uses less digits than its factorization.

81548206874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228445.

The product of its (nonzero) digits is 3440640, while the sum is 53.

The spelling of 81548206874 in words is "eighty-one billion, five hundred forty-eight million, two hundred six thousand, eight hundred seventy-four".