81602140320877 has 16 divisors (see below), whose sum is σ = 90127587332160. Its totient is φ = 73261890284800.

The previous prime is 81602140320871. The next prime is 81602140320907. The reversal of 81602140320877 is 77802304120618.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81602140320877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81602140320877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81602140320871) 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, 14746774 + ... + 19510807.

It is an arithmetic number, because the mean of its divisors is an integer number (5632974208260).

Almost surely, 2^{81602140320877} is an apocalyptic number.

It is an amenable number.

81602140320877 is a deficient number, since it is larger than the sum of its proper divisors (8525447011283).

81602140320877 is a wasteful number, since it uses less digits than its factorization.

81602140320877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34260284.

The product of its (nonzero) digits is 903168, while the sum is 49.

The spelling of 81602140320877 in words is "eighty-one trillion, six hundred two billion, one hundred forty million, three hundred twenty thousand, eight hundred seventy-seven".