81447148005 has 96 divisors (see below), whose sum is σ = 142674324480. Its totient is φ = 39586713600.

The previous prime is 81447147941. The next prime is 81447148007. The reversal of 81447148005 is 50084174418.

It is not a de Polignac number, because 81447148005 - 2⁶ = 81447147941 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81447148007) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 22666489 + ... + 22670081.

It is an arithmetic number, because the mean of its divisors is an integer number (1486190880).

Almost surely, 2^81447148005 is an apocalyptic number.

It is an amenable number.

81447148005 is a deficient number, since it is larger than the sum of its proper divisors (61227176475).

81447148005 is a wasteful number, since it uses less digits than its factorization.

81447148005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3743 (or 3702 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 42.

The spelling of 81447148005 in words is "eighty-one billion, four hundred forty-seven million, one hundred forty-eight thousand, five".