64747641600 has 1296 divisors, whose sum is σ = 265702993920. Its totient is φ = 15527116800.

The previous prime is 64747641577. The next prime is 64747641653. The reversal of 64747641600 is 614674746.

It is a tau number, because it is divible by the number of its divisors (1296).

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 143 ways as a sum of consecutive naturals, for example, 819590361 + ... + 819590439.

Almost surely, 2^64747641600 is an apocalyptic number.

64747641600 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 64747641600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132851496960).

64747641600 is an abundant number, since it is smaller than the sum of its proper divisors (200955352320).

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

64747641600 is a wasteful number, since it uses less digits than its factorization.

64747641600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 64747641600 in words is "sixty-four billion, seven hundred forty-seven million, six hundred forty-one thousand, six hundred".