81444710148 has 48 divisors (see below), whose sum is σ = 200440800000. Its totient is φ = 25667804448.

The previous prime is 81444710107. The next prime is 81444710177. The reversal of 81444710148 is 84101744418.

It is a super-2 number, since 2×81444710148² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244158 + ... + 471701.

It is an arithmetic number, because the mean of its divisors is an integer number (4175850000).

Almost surely, 2^81444710148 is an apocalyptic number.

It is an amenable number.

81444710148 is an abundant number, since it is smaller than the sum of its proper divisors (118996089852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81444710148 is a wasteful number, since it uses less digits than its factorization.

81444710148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716384 (or 716382 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 42.

The spelling of 81444710148 in words is "eighty-one billion, four hundred forty-four million, seven hundred ten thousand, one hundred forty-eight".