6661280724 has 48 divisors (see below), whose sum is σ = 17794761600. Its totient is φ = 1899864576.

The previous prime is 6661280641. The next prime is 6661280741. The reversal of 6661280724 is 4270821666.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21889 + ... + 117480.

It is an arithmetic number, because the mean of its divisors is an integer number (370724200).

Almost surely, 2^6661280724 is an apocalyptic number.

It is an amenable number.

6661280724 is an abundant number, since it is smaller than the sum of its proper divisors (11133480876).

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

6661280724 is a wasteful number, since it uses less digits than its factorization.

6661280724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139952 (or 139950 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 6661280724 is about 81616.6694003131. The cubic root of 6661280724 is about 1881.5650846012.

The spelling of 6661280724 in words is "six billion, six hundred sixty-one million, two hundred eighty thousand, seven hundred twenty-four".