86642821650 has 288 divisors, whose sum is σ = 275765653440. Its totient is φ = 17799936000.

The previous prime is 86642821637. The next prime is 86642821691. The reversal of 86642821650 is 5612824668.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 86642821650.

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, 7189630 + ... + 7201670.

It is an arithmetic number, because the mean of its divisors is an integer number (957519630).

Almost surely, 2^86642821650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86642821650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137882826720).

86642821650 is an abundant number, since it is smaller than the sum of its proper divisors (189122831790).

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

86642821650 is a wasteful number, since it uses less digits than its factorization.

86642821650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12170 (or 12158 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 48.

The spelling of 86642821650 in words is "eighty-six billion, six hundred forty-two million, eight hundred twenty-one thousand, six hundred fifty".