81708333378 has 16 divisors (see below), whose sum is σ = 186761904960. Its totient is φ = 23345238096.

The previous prime is 81708333353. The next prime is 81708333383. The reversal of 81708333378 is 87333380718.

It is a self number, because there is not a number n which added to its sum of digits gives 81708333378.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 972718213 + ... + 972718296.

It is an arithmetic number, because the mean of its divisors is an integer number (11672619060).

Almost surely, 2^81708333378 is an apocalyptic number.

81708333378 is an abundant number, since it is smaller than the sum of its proper divisors (105053571582).

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

81708333378 is a wasteful number, since it uses less digits than its factorization.

81708333378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945436521.

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 81708333378 in words is "eighty-one billion, seven hundred eight million, three hundred thirty-three thousand, three hundred seventy-eight".