20615616560512 has 64 divisors (see below), whose sum is σ = 41348693700000. Its totient is φ = 10237914861568.

The previous prime is 20615616560509. The next prime is 20615616560537. The reversal of 20615616560512 is 21506561651602.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367851789 + ... + 367907827.

Almost surely, 2^{20615616560512} 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 20615616560512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20674346850000).

20615616560512 is an abundant number, since it is smaller than the sum of its proper divisors (20733077139488).

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

20615616560512 is a wasteful number, since it uses less digits than its factorization.

20615616560512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75491 (or 75479 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 20615616560512 in words is "twenty trillion, six hundred fifteen billion, six hundred sixteen million, five hundred sixty thousand, five hundred twelve".