64544315040 has 72 divisors (see below), whose sum is σ = 220257479988. Its totient is φ = 17211816960.

The previous prime is 64544314981. The next prime is 64544315063. The reversal of 64544315040 is 4051344546.

64544315040 is a `hidden beast` number, since 64 + 5 + 443 + 150 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61696598544 + 2847716496 = 248388^2 + 53364^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 64544314986 and 64544315004.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22409781 + ... + 22412660.

Almost surely, 2^64544315040 is an apocalyptic number.

64544315040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64544315040 is an abundant number, since it is smaller than the sum of its proper divisors (155713164948).

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

64544315040 is a wasteful number, since it uses less digits than its factorization.

64544315040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44822462 (or 44822451 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 64544315040 its reverse (4051344546), we get a palindrome (68595659586).

The spelling of 64544315040 in words is "sixty-four billion, five hundred forty-four million, three hundred fifteen thousand, forty".