6661401024 has 112 divisors (see below), whose sum is σ = 18247685120. Its totient is φ = 2142443520.

The previous prime is 6661400981. The next prime is 6661401053. The reversal of 6661401024 is 4201041666.

It is a junction number, because it is equal to n+sod(n) for n = 6661400982 and 6661401000.

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, 2254332 + ... + 2257284.

It is an arithmetic number, because the mean of its divisors is an integer number (162925760).

Almost surely, 2^6661401024 is an apocalyptic number.

6661401024 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6661401024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9123842560).

6661401024 is an abundant number, since it is smaller than the sum of its proper divisors (11586284096).

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

6661401024 is a wasteful number, since it uses less digits than its factorization.

6661401024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378 (or 3368 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 6661401024 is about 81617.4063787866. The cubic root of 6661401024 is about 1881.5764112978.

The spelling of 6661401024 in words is "six billion, six hundred sixty-one million, four hundred one thousand, twenty-four".