64521650620550 has 96 divisors (see below), whose sum is σ = 132188776653600. Its totient is φ = 23340631541760.

The previous prime is 64521650620501. The next prime is 64521650620571. The reversal of 64521650620550 is 5502605612546.

It is a junction number, because it is equal to n+sod(n) for n = 64521650620495 and 64521650620504.

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, 15454115 + ... + 19180014.

It is an arithmetic number, because the mean of its divisors is an integer number (1376966423475).

Almost surely, 2^{64521650620550} is an apocalyptic number.

64521650620550 is an abundant number, since it is smaller than the sum of its proper divisors (67667126033050).

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

64521650620550 is a wasteful number, since it uses less digits than its factorization.

64521650620550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34634250 (or 34634245 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 47.

The spelling of 64521650620550 in words is "sixty-four trillion, five hundred twenty-one billion, six hundred fifty million, six hundred twenty thousand, five hundred fifty".