64243163544 has 32 divisors (see below), whose sum is σ = 183551896320. Its totient is φ = 18355189536.

The previous prime is 64243163497. The next prime is 64243163549. The reversal of 64243163544 is 44536134246.

64243163544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64243163544² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 64243163496 and 64243163505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64243163549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191199724 + ... + 191200059.

It is an arithmetic number, because the mean of its divisors is an integer number (5735996760).

Almost surely, 2^64243163544 is an apocalyptic number.

It is an amenable number.

64243163544 is an abundant number, since it is smaller than the sum of its proper divisors (119308732776).

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

64243163544 is a wasteful number, since it uses less digits than its factorization.

64243163544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382399799 (or 382399795 counting only the distinct ones).

The product of its digits is 829440, while the sum is 42.

The spelling of 64243163544 in words is "sixty-four billion, two hundred forty-three million, one hundred sixty-three thousand, five hundred forty-four".