64645658880 has 288 divisors, whose sum is σ = 227957345280. Its totient is φ = 15482019840.

The previous prime is 64645658863. The next prime is 64645658893. The reversal of 64645658880 is 8885654646.

It is a super-2 number, since 2×64645658880² (a number of 22 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3496701 + ... + 3515139.

It is an arithmetic number, because the mean of its divisors is an integer number (791518560).

Almost surely, 2^64645658880 is an apocalyptic number.

64645658880 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 64645658880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113978672640).

64645658880 is an abundant number, since it is smaller than the sum of its proper divisors (163311686400).

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

64645658880 is a wasteful number, since it uses less digits than its factorization.

64645658880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18557 (or 18543 counting only the distinct ones).

The product of its (nonzero) digits is 44236800, while the sum is 60.

The spelling of 64645658880 in words is "sixty-four billion, six hundred forty-five million, six hundred fifty-eight thousand, eight hundred eighty".