64157781536300 has 72 divisors (see below), whose sum is σ = 141310902231744. Its totient is φ = 25278189963840.

The previous prime is 64157781536293. The next prime is 64157781536309. The reversal of 64157781536300 is 363518775146.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (64157781536309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90949547 + ... + 91652253.

Almost surely, 2^{64157781536300} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64157781536300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70655451115872).

64157781536300 is an abundant number, since it is smaller than the sum of its proper divisors (77153120695444).

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

64157781536300 is a wasteful number, since it uses less digits than its factorization.

64157781536300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716415 (or 716408 counting only the distinct ones).

The product of its (nonzero) digits is 12700800, while the sum is 56.

The spelling of 64157781536300 in words is "sixty-four trillion, one hundred fifty-seven billion, seven hundred eighty-one million, five hundred thirty-six thousand, three hundred".