65615505012 has 72 divisors (see below), whose sum is σ = 173233517184. Its totient is φ = 20901456576.

The previous prime is 65615505001. The next prime is 65615505017. The reversal of 65615505012 is 21050551656.

65615505012 is a `hidden beast` number, since 6 + 56 + 1 + 550 + 50 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65615505017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 868753 + ... + 941255.

It is an arithmetic number, because the mean of its divisors is an integer number (2406021072).

Almost surely, 2^65615505012 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 65615505012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86616758592).

65615505012 is an abundant number, since it is smaller than the sum of its proper divisors (107618012172).

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

65615505012 is a wasteful number, since it uses less digits than its factorization.

65615505012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73629 (or 73624 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 65615505012 in words is "sixty-five billion, six hundred fifteen million, five hundred five thousand, twelve".