64555622655546 has 128 divisors (see below), whose sum is σ = 145529116508160. Its totient is φ = 18918815328000.

The previous prime is 64555622655463. The next prime is 64555622655611.

64555622655546 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 505544935 + ... + 505672613.

It is an arithmetic number, because the mean of its divisors is an integer number (1136946222720).

Almost surely, 2^{64555622655546} is an apocalyptic number.

64555622655546 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 64555622655546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72764558254080).

64555622655546 is an abundant number, since it is smaller than the sum of its proper divisors (80973493852614).

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

64555622655546 is a wasteful number, since it uses less digits than its factorization.

64555622655546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128980.

The product of its digits is 1296000000, while the sum is 66.

The spelling of 64555622655546 in words is "sixty-four trillion, five hundred fifty-five billion, six hundred twenty-two million, six hundred fifty-five thousand, five hundred forty-six".