65777987360 has 96 divisors (see below), whose sum is σ = 162611753472. Its totient is φ = 25113507840.

The previous prime is 65777987351. The next prime is 65777987389. The reversal of 65777987360 is 6378977756.

It is a super-2 number, since 2×65777987360² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271247 + ... + 452913.

It is an arithmetic number, because the mean of its divisors is an integer number (1693872432).

Almost surely, 2^65777987360 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 65777987360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81305876736).

65777987360 is an abundant number, since it is smaller than the sum of its proper divisors (96833766112).

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

65777987360 is a wasteful number, since it uses less digits than its factorization.

65777987360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181786 (or 181778 counting only the distinct ones).

The product of its (nonzero) digits is 93350880, while the sum is 65.

The spelling of 65777987360 in words is "sixty-five billion, seven hundred seventy-seven million, nine hundred eighty-seven thousand, three hundred sixty".