65521464540000 has 480 divisors, whose sum is σ = 245772300888576. Its totient is φ = 14967467520000.

The previous prime is 65521464539987. The next prime is 65521464540011. The reversal of 65521464540000 is 4546412556.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 722774677 + ... + 722865323.

Almost surely, 2^{65521464540000} is an apocalyptic number.

65521464540000 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 65521464540000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122886150444288).

65521464540000 is an abundant number, since it is smaller than the sum of its proper divisors (180250836348576).

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

65521464540000 is a wasteful number, since it uses less digits than its factorization.

65521464540000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92408 (or 92385 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 65521464540000 in words is "sixty-five trillion, five hundred twenty-one billion, four hundred sixty-four million, five hundred forty thousand".