65897351520 has 1536 divisors, whose sum is σ = 298478960640. Its totient is φ = 11775836160.

The previous prime is 65897351501. The next prime is 65897351551. The reversal of 65897351520 is 2515379856.

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 255 ways as a sum of consecutive naturals, for example, 740419636 + ... + 740419724.

It is an arithmetic number, because the mean of its divisors is an integer number (194322240).

Almost surely, 2^65897351520 is an apocalyptic number.

65897351520 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 65897351520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149239480320).

65897351520 is an abundant number, since it is smaller than the sum of its proper divisors (232581609120).

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

65897351520 is a wasteful number, since it uses less digits than its factorization.

65897351520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 51.

The spelling of 65897351520 in words is "sixty-five billion, eight hundred ninety-seven million, three hundred fifty-one thousand, five hundred twenty".