64474950557920 has 192 divisors, whose sum is σ = 174466752768000. Its totient is φ = 22056925667328.

The previous prime is 64474950557893. The next prime is 64474950557947. The reversal of 64474950557920 is 2975505947446.

It is an interprime number because it is at equal distance from previous prime (64474950557893) and next prime (64474950557947).

It is a congruent number.

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, 1327631559 + ... + 1327680121.

It is an arithmetic number, because the mean of its divisors is an integer number (908681004000).

Almost surely, 2^{64474950557920} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64474950557920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87233376384000).

64474950557920 is an abundant number, since it is smaller than the sum of its proper divisors (109991802210080).

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

64474950557920 is a wasteful number, since it uses less digits than its factorization.

64474950557920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51177 (or 51169 counting only the distinct ones).

The product of its (nonzero) digits is 381024000, while the sum is 67.

The spelling of 64474950557920 in words is "sixty-four trillion, four hundred seventy-four billion, nine hundred fifty million, five hundred fifty-seven thousand, nine hundred twenty".