81678418458 has 32 divisors (see below), whose sum is σ = 201054569856. Its totient is φ = 21541560768.

The previous prime is 81678418453. The next prime is 81678418469. The reversal of 81678418458 is 85481487618.

It is not an unprimeable number, because it can be changed into a prime (81678418453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74796541 + ... + 74797632.

It is an arithmetic number, because the mean of its divisors is an integer number (6282955308).

Almost surely, 2^81678418458 is an apocalyptic number.

81678418458 is an abundant number, since it is smaller than the sum of its proper divisors (119376151398).

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

81678418458 is a wasteful number, since it uses less digits than its factorization.

81678418458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149594198.

The product of its digits is 13762560, while the sum is 60.

The spelling of 81678418458 in words is "eighty-one billion, six hundred seventy-eight million, four hundred eighteen thousand, four hundred fifty-eight".