6661891152 has 60 divisors (see below), whose sum is σ = 21307480480. Its totient is φ = 1903397184.

The previous prime is 6661891141. The next prime is 6661891153. The reversal of 6661891152 is 2511981666.

It is a junction number, because it is equal to n+sod(n) for n = 6661891098 and 6661891107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661891153) 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, 3303502 + ... + 3305517.

Almost surely, 2^6661891152 is an apocalyptic number.

It is an amenable number.

6661891152 is an abundant number, since it is smaller than the sum of its proper divisors (14645589328).

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

6661891152 is a wasteful number, since it uses less digits than its factorization.

6661891152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6609040 (or 6609031 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 6661891152 is about 81620.4089183582. The cubic root of 6661891152 is about 1881.6225572794.

The spelling of 6661891152 in words is "six billion, six hundred sixty-one million, eight hundred ninety-one thousand, one hundred fifty-two".