64711769856 has 288 divisors, whose sum is σ = 185088288000. Its totient is φ = 20012728320.

The previous prime is 64711769819. The next prime is 64711769897. The reversal of 64711769856 is 65896711746.

It is a super-2 number, since 2×64711769856² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64711769856.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 185420370 + ... + 185420718.

Almost surely, 2^64711769856 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 64711769856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92544144000).

64711769856 is an abundant number, since it is smaller than the sum of its proper divisors (120376518144).

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

64711769856 is a wasteful number, since it uses less digits than its factorization.

64711769856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615 (or 601 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 60.

The spelling of 64711769856 in words is "sixty-four billion, seven hundred eleven million, seven hundred sixty-nine thousand, eight hundred fifty-six".