65644992000 has 1280 divisors, whose sum is σ = 284756060160. Its totient is φ = 14780620800.

The previous prime is 65644991983. The next prime is 65644992103. The reversal of 65644992000 is 29944656.

It is a tau number, because it is divible by the number of its divisors (1280).

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 polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 979775967 + ... + 979776033.

It is an arithmetic number, because the mean of its divisors is an integer number (222465672).

Almost surely, 2^65644992000 is an apocalyptic number.

65644992000 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 65644992000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142378030080).

65644992000 is an abundant number, since it is smaller than the sum of its proper divisors (219111068160).

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

65644992000 is an frugal number, since it uses more digits than its factorization.

65644992000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 65644992000 in words is "sixty-five billion, six hundred forty-four million, nine hundred ninety-two thousand".