206661642 has 16 divisors (see below), whose sum is σ = 450898272. Its totient is φ = 62624720.

The previous prime is 206661583. The next prime is 206661661. The reversal of 206661642 is 246166602.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1565553 + ... + 1565684.

It is an arithmetic number, because the mean of its divisors is an integer number (28181142).

Almost surely, 2^206661642 is an apocalyptic number.

206661642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

206661642 is an abundant number, since it is smaller than the sum of its proper divisors (244236630).

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

206661642 is a wasteful number, since it uses less digits than its factorization.

206661642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3131253.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 206661642 is about 14375.7310075001. The cubic root of 206661642 is about 591.2256833174.

The spelling of 206661642 in words is "two hundred six million, six hundred sixty-one thousand, six hundred forty-two".