6690451280 has 40 divisors (see below), whose sum is σ = 15620428800. Its totient is φ = 2664975488.

The previous prime is 6690451267. The next prime is 6690451309. The reversal of 6690451280 is 821540966.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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, 155840 + ... + 194079.

It is an arithmetic number, because the mean of its divisors is an integer number (390510720).

Almost surely, 2^6690451280 is an apocalyptic number.

It is an amenable number.

6690451280 is an abundant number, since it is smaller than the sum of its proper divisors (8929977520).

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

6690451280 is a wasteful number, since it uses less digits than its factorization.

6690451280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350171 (or 350165 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 6690451280 is about 81795.1788310289. The cubic root of 6690451280 is about 1884.3076190760.

The spelling of 6690451280 in words is "six billion, six hundred ninety million, four hundred fifty-one thousand, two hundred eighty".