206645167421 has 12 divisors (see below), whose sum is σ = 259587318816. Its totient is φ = 161022207720.

The previous prime is 206645167409. The next prime is 206645167423. The reversal of 206645167421 is 124761546602.

It is not a de Polignac number, because 206645167421 - 2²² = 206640973117 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206645167423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121985675 + ... + 121987368.

It is an arithmetic number, because the mean of its divisors is an integer number (21632276568).

Almost surely, 2^206645167421 is an apocalyptic number.

It is an amenable number.

206645167421 is a deficient number, since it is larger than the sum of its proper divisors (52942151395).

206645167421 is a wasteful number, since it uses less digits than its factorization.

206645167421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243973072 (or 243973061 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 206645167421 in words is "two hundred six billion, six hundred forty-five million, one hundred sixty-seven thousand, four hundred twenty-one".