81676109040 has 40 divisors (see below), whose sum is σ = 253195938768. Its totient is φ = 21780295680.

The previous prime is 81676109023. The next prime is 81676109069. The reversal of 81676109040 is 4090167618.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 81676108983 and 81676109001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170158321 + ... + 170158800.

Almost surely, 2^81676109040 is an apocalyptic number.

81676109040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81676109040 is an abundant number, since it is smaller than the sum of its proper divisors (171519829728).

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

81676109040 is a wasteful number, since it uses less digits than its factorization.

81676109040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340317137 (or 340317131 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 81676109040 in words is "eighty-one billion, six hundred seventy-six million, one hundred nine thousand, forty".