6651323280 has 120 divisors (see below), whose sum is σ = 25528431552. Its totient is φ = 1520301312.

The previous prime is 6651323269. The next prime is 6651323281. The reversal of 6651323280 is 823231566.

It is a happy number.

6651323280 is a `hidden beast` number, since 6 + 6 + 51 + 323 + 280 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

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 (6651323281) 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, 654814 + ... + 664893.

Almost surely, 2^6651323280 is an apocalyptic number.

6651323280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6651323280 is an abundant number, since it is smaller than the sum of its proper divisors (18877108272).

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

6651323280 is a wasteful number, since it uses less digits than its factorization.

6651323280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319733 (or 1319724 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 6651323280 is about 81555.6452981644. The cubic root of 6651323280 is about 1880.6270806865.

The spelling of 6651323280 in words is "six billion, six hundred fifty-one million, three hundred twenty-three thousand, two hundred eighty".