64899216000 has 384 divisors, whose sum is σ = 241121696400. Its totient is φ = 16708608000.

The previous prime is 64899215993. The next prime is 64899216017. The reversal of 64899216000 is 61299846.

It is a happy number.

64899216000 is a `hidden beast` number, since 6 + 489 + 9 + 2 + 160 + 0 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 7287695424 + 57611520576 = 85368^2 + 240024^2 .

It is a tau number, because it is divible by the number of its divisors (384).

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4168230 + ... + 4183770.

Almost surely, 2^64899216000 is an apocalyptic number.

64899216000 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 64899216000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120560848200).

64899216000 is an abundant number, since it is smaller than the sum of its proper divisors (176222480400).

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

64899216000 is a wasteful number, since it uses less digits than its factorization.

64899216000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15605 (or 15580 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 64899216000 in words is "sixty-four billion, eight hundred ninety-nine million, two hundred sixteen thousand".