64425804156 has 144 divisors (see below), whose sum is σ = 188324188416. Its totient is φ = 18189868032.

The previous prime is 64425804139. The next prime is 64425804169. The reversal of 64425804156 is 65140852446.

It is a happy number.

64425804156 is a `hidden beast` number, since 6 + 442 + 58 + 0 + 4 + 156 = 666.

It is a super-2 number, since 2×64425804156² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20213595 + ... + 20216781.

It is an arithmetic number, because the mean of its divisors is an integer number (1307806864).

Almost surely, 2^64425804156 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 64425804156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94162094208).

64425804156 is an abundant number, since it is smaller than the sum of its proper divisors (123898384260).

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

64425804156 is a wasteful number, since it uses less digits than its factorization.

64425804156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4128 (or 4123 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The spelling of 64425804156 in words is "sixty-four billion, four hundred twenty-five million, eight hundred four thousand, one hundred fifty-six".