64345355520 has 144 divisors (see below), whose sum is σ = 207073323072. Its totient is φ = 17027645440.

The previous prime is 64345355497. The next prime is 64345355551. The reversal of 64345355520 is 2555354346.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 439084 + ... + 566996.

It is an arithmetic number, because the mean of its divisors is an integer number (1438009188).

Almost surely, 2^64345355520 is an apocalyptic number.

64345355520 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 64345355520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103536661536).

64345355520 is an abundant number, since it is smaller than the sum of its proper divisors (142727967552).

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

64345355520 is a wasteful number, since it uses less digits than its factorization.

64345355520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128068 (or 128054 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 42.

The spelling of 64345355520 in words is "sixty-four billion, three hundred forty-five million, three hundred fifty-five thousand, five hundred twenty".