655511616 has 140 divisors (see below), whose sum is σ = 2006315520. Its totient is φ = 211403520.

The previous prime is 655511543. The next prime is 655511617. The reversal of 655511616 is 616115556.

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

It is not an unprimeable number, because it can be changed into a prime (655511617) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 158665 + ... + 162743.

Almost surely, 2^655511616 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 655511616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1003157760).

655511616 is an abundant number, since it is smaller than the sum of its proper divisors (1350803904).

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

655511616 is a wasteful number, since it uses less digits than its factorization.

655511616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4134 (or 4115 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 655511616 is about 25602.9610787502. The cubic root of 655511616 is about 868.6806160552.

The spelling of 655511616 in words is "six hundred fifty-five million, five hundred eleven thousand, six hundred sixteen".