64551540000 has 120 divisors (see below), whose sum is σ = 211742158320. Its totient is φ = 17213728000.

The previous prime is 64551539999. The next prime is 64551540013. The reversal of 64551540000 is 4515546.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 64551540000.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 477930 + ... + 597929.

It is an arithmetic number, because the mean of its divisors is an integer number (1764517986).

Almost surely, 2^64551540000 is an apocalyptic number.

64551540000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64551540000 is an abundant number, since it is smaller than the sum of its proper divisors (147190618320).

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

64551540000 is a wasteful number, since it uses less digits than its factorization.

64551540000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075892 (or 1075869 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 64551540000 in words is "sixty-four billion, five hundred fifty-one million, five hundred forty thousand".