81447414678 has 48 divisors (see below), whose sum is σ = 209148925440. Its totient is φ = 23270688936.

The previous prime is 81447414661. The next prime is 81447414721. The reversal of 81447414678 is 87641474418.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11967118 + ... + 11973921.

It is an arithmetic number, because the mean of its divisors is an integer number (4357269280).

Almost surely, 2^81447414678 is an apocalyptic number.

81447414678 is an abundant number, since it is smaller than the sum of its proper divisors (127701510762).

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

81447414678 is a wasteful number, since it uses less digits than its factorization.

81447414678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23941063 (or 23941051 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 54.

The spelling of 81447414678 in words is "eighty-one billion, four hundred forty-seven million, four hundred fourteen thousand, six hundred seventy-eight".