77757321071540 has 96 divisors (see below), whose sum is σ = 179759667394944. Its totient is φ = 28018527989760.

The previous prime is 77757321071533. The next prime is 77757321071593. The reversal of 77757321071540 is 4517012375777.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8867672 + ... + 15301968.

It is an arithmetic number, because the mean of its divisors is an integer number (1872496535364).

Almost surely, 2^{77757321071540} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77757321071540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89879833697472).

77757321071540 is an abundant number, since it is smaller than the sum of its proper divisors (102002346323404).

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

77757321071540 is a wasteful number, since it uses less digits than its factorization.

77757321071540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6434817 (or 6434815 counting only the distinct ones).

The product of its (nonzero) digits is 10084200, while the sum is 56.

The spelling of 77757321071540 in words is "seventy-seven trillion, seven hundred fifty-seven billion, three hundred twenty-one million, seventy-one thousand, five hundred forty".