65250551808 has 480 divisors, whose sum is σ = 213102489600. Its totient is φ = 19771195392.

The previous prime is 65250551777. The next prime is 65250551813. The reversal of 65250551808 is 80815505256.

65250551808 is a `hidden beast` number, since 65 + 2 + 505 + 5 + 1 + 80 + 8 = 666.

It is a super-2 number, since 2×65250551808² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 170366785 + ... + 170367167.

It is an arithmetic number, because the mean of its divisors is an integer number (443963520).

Almost surely, 2^65250551808 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 65250551808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106551244800).

65250551808 is an abundant number, since it is smaller than the sum of its proper divisors (147851937792).

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

65250551808 is a wasteful number, since it uses less digits than its factorization.

65250551808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 45.

The spelling of 65250551808 in words is "sixty-five billion, two hundred fifty million, five hundred fifty-one thousand, eight hundred eight".