65195591040 has 320 divisors, whose sum is σ = 233410422960. Its totient is φ = 17341820928.

The previous prime is 65195590997. The next prime is 65195591051. The reversal of 65195591040 is 4019559156.

It is a happy number.

65195591040 is a `hidden beast` number, since 6 + 5 + 19 + 5 + 591 + 0 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (45).

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 39 ways as a sum of consecutive naturals, for example, 24207934 + ... + 24210626.

Almost surely, 2^65195591040 is an apocalyptic number.

65195591040 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 65195591040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116705211480).

65195591040 is an abundant number, since it is smaller than the sum of its proper divisors (168214831920).

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

65195591040 is a wasteful number, since it uses less digits than its factorization.

65195591040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3191 (or 3170 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The spelling of 65195591040 in words is "sixty-five billion, one hundred ninety-five million, five hundred ninety-one thousand, forty".