65808877680 has 1200 divisors, whose sum is σ = 290948565600. Its totient is φ = 13662867456.

The previous prime is 65808877663. The next prime is 65808877697. The reversal of 65808877680 is 8677880856.

It is an interprime number because it is at equal distance from previous prime (65808877663) and next prime (65808877697).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 441670246 + ... + 441670394.

It is an arithmetic number, because the mean of its divisors is an integer number (242457138).

Almost surely, 2^65808877680 is an apocalyptic number.

65808877680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65808877680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145474282800).

65808877680 is an abundant number, since it is smaller than the sum of its proper divisors (225139687920).

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

65808877680 is a wasteful number, since it uses less digits than its factorization.

65808877680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 63.

The spelling of 65808877680 in words is "sixty-five billion, eight hundred eight million, eight hundred seventy-seven thousand, six hundred eighty".