206665426366400 has 84 divisors (see below), whose sum is σ = 519345819511008. Its totient is φ = 80907315824640.

The previous prime is 206665426366397. The next prime is 206665426366501. The reversal of 206665426366400 is 4663624566602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1374030029 + ... + 1374180428.

It is an arithmetic number, because the mean of its divisors is an integer number (6182688327512).

Almost surely, 2^{206665426366400} is an apocalyptic number.

206665426366400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206665426366400 is an abundant number, since it is smaller than the sum of its proper divisors (312680393144608).

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

206665426366400 is a wasteful number, since it uses less digits than its factorization.

206665426366400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748210526 (or 2748210511 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 56.

The spelling of 206665426366400 in words is "two hundred six trillion, six hundred sixty-five billion, four hundred twenty-six million, three hundred sixty-six thousand, four hundred".