81378676071 has 96 divisors (see below), whose sum is σ = 149866149888. Its totient is φ = 41321041920.

The previous prime is 81378676033. The next prime is 81378676081. The reversal of 81378676071 is 17067687318.

It is not a de Polignac number, because 81378676071 - 2⁷ = 81378675943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81378675999 and 81378676017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81378676021) 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, 39637881 + ... + 39639933.

It is an arithmetic number, because the mean of its divisors is an integer number (1561105728).

Almost surely, 2^81378676071 is an apocalyptic number.

81378676071 is a deficient number, since it is larger than the sum of its proper divisors (68487473817).

81378676071 is a wasteful number, since it uses less digits than its factorization.

81378676071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341 (or 3338 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 54.

The spelling of 81378676071 in words is "eighty-one billion, three hundred seventy-eight million, six hundred seventy-six thousand, seventy-one".