64849997744 has 80 divisors (see below), whose sum is σ = 151946465280. Its totient is φ = 26192056320.

The previous prime is 64849997711. The next prime is 64849997747. The reversal of 64849997744 is 44779994846.

It is not an unprimeable number, because it can be changed into a prime (64849997747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326672 + ... + 486224.

It is an arithmetic number, because the mean of its divisors is an integer number (1899330816).

Almost surely, 2^64849997744 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 64849997744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75973232640).

64849997744 is an abundant number, since it is smaller than the sum of its proper divisors (87096467536).

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

64849997744 is a wasteful number, since it uses less digits than its factorization.

64849997744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159778 (or 159772 counting only the distinct ones).

The product of its digits is 438939648, while the sum is 71.

The spelling of 64849997744 in words is "sixty-four billion, eight hundred forty-nine million, nine hundred ninety-seven thousand, seven hundred forty-four".