206660837147400 has 576 divisors, whose sum is σ = 741084276142080. Its totient is φ = 51429095424000.

The previous prime is 206660837147399. The next prime is 206660837147411. The reversal of 206660837147400 is 4741738066602.

It is a super-2 number, since 2×206660837147400² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 6999031437 + ... + 6999060963.

It is an arithmetic number, because the mean of its divisors is an integer number (1286604646080).

Almost surely, 2^{206660837147400} is an apocalyptic number.

206660837147400 is a gapful number since it is divisible by the number (20) 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 206660837147400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370542138071040).

206660837147400 is an abundant number, since it is smaller than the sum of its proper divisors (534423438994680).

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

206660837147400 is a wasteful number, since it uses less digits than its factorization.

206660837147400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31494 (or 31482 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 54.

The spelling of 206660837147400 in words is "two hundred six trillion, six hundred sixty billion, eight hundred thirty-seven million, one hundred forty-seven thousand, four hundred".