1246666680 has 256 divisors, whose sum is σ = 4798310400. Its totient is φ = 282009600.

The previous prime is 1246666679. The next prime is 1246666691. The reversal of 1246666680 is 866666421.

It is a super-2 number, since 2×1246666680² = 3108355622044444800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 777880 + ... + 779480.

It is an arithmetic number, because the mean of its divisors is an integer number (18743400).

Almost surely, 2^1246666680 is an apocalyptic number.

1246666680 is a gapful number since it is divisible by the number (10) 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 1246666680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2399155200).

1246666680 is an abundant number, since it is smaller than the sum of its proper divisors (3551643720).

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

1246666680 is a wasteful number, since it uses less digits than its factorization.

1246666680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731 (or 1721 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 1246666680 is about 35308.1673271214. The cubic root of 1246666680 is about 1076.2589699261.

The spelling of 1246666680 in words is "one billion, two hundred forty-six million, six hundred sixty-six thousand, six hundred eighty".