6661512216 has 48 divisors (see below), whose sum is σ = 18288755160. Its totient is φ = 2190084480.

The previous prime is 6661512211. The next prime is 6661512293. The reversal of 6661512216 is 6122151666.

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 (6661512211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 628450 + ... + 638961.

Almost surely, 2^6661512216 is an apocalyptic number.

It is an amenable number.

6661512216 is an abundant number, since it is smaller than the sum of its proper divisors (11627242944).

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

6661512216 is a wasteful number, since it uses less digits than its factorization.

6661512216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267496 (or 1267489 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 6661512216 is about 81618.0875541690. The cubic root of 6661512216 is about 1881.5868803208.

The spelling of 6661512216 in words is "six billion, six hundred sixty-one million, five hundred twelve thousand, two hundred sixteen".