64881536850 has 288 divisors, whose sum is σ = 197309496384. Its totient is φ = 15175641600.

The previous prime is 64881536827. The next prime is 64881536879. The reversal of 64881536850 is 5863518846.

64881536850 is a `hidden beast` number, since 6 + 488 + 1 + 53 + 68 + 50 = 666.

It is a super-2 number, since 2×64881536850² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 9303865 + ... + 9310835.

It is an arithmetic number, because the mean of its divisors is an integer number (685102418).

Almost surely, 2^64881536850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64881536850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98654748192).

64881536850 is an abundant number, since it is smaller than the sum of its proper divisors (132427959534).

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

64881536850 is a wasteful number, since it uses less digits than its factorization.

64881536850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7082 (or 7074 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 54.

The spelling of 64881536850 in words is "sixty-four billion, eight hundred eighty-one million, five hundred thirty-six thousand, eight hundred fifty".