64551114665880 has 256 divisors, whose sum is σ = 211602499891200. Its totient is φ = 15709880309760.

The previous prime is 64551114665857. The next prime is 64551114665881. The reversal of 64551114665880 is 8856641115546.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64551114665881) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2318839 + ... + 11596518.

It is an arithmetic number, because the mean of its divisors is an integer number (826572265200).

Almost surely, 2^{64551114665880} is an apocalyptic number.

64551114665880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64551114665880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105801249945600).

64551114665880 is an abundant number, since it is smaller than the sum of its proper divisors (147051385225320).

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

64551114665880 is a wasteful number, since it uses less digits than its factorization.

64551114665880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13915474 (or 13915470 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 60.

The spelling of 64551114665880 in words is "sixty-four trillion, five hundred fifty-one billion, one hundred fourteen million, six hundred sixty-five thousand, eight hundred eighty".