64691978899200 has 216 divisors, whose sum is σ = 213549352800000. Its totient is φ = 17246964756480.

The previous prime is 64691978899199. The next prime is 64691978899231. The reversal of 64691978899200 is 299887919646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78289801 + ... + 79111799.

Almost surely, 2^{64691978899200} is an apocalyptic number.

64691978899200 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 64691978899200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106774676400000).

64691978899200 is an abundant number, since it is smaller than the sum of its proper divisors (148857373900800).

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

64691978899200 is a wasteful number, since it uses less digits than its factorization.

64691978899200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826127 (or 826108 counting only the distinct ones).

The product of its (nonzero) digits is 846526464, while the sum is 78.

The spelling of 64691978899200 in words is "sixty-four trillion, six hundred ninety-one billion, nine hundred seventy-eight million, eight hundred ninety-nine thousand, two hundred".