208955053661 has 8 divisors (see below), whose sum is σ = 215056870560. Its totient is φ = 202938577072.

The previous prime is 208955053639. The next prime is 208955053687. The reversal of 208955053661 is 166350559802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 208955053661 - 2¹⁸ = 208954791517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208955052661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21330110 + ... + 21339903.

It is an arithmetic number, because the mean of its divisors is an integer number (26882108820).

Almost surely, 2^208955053661 is an apocalyptic number.

It is an amenable number.

208955053661 is a deficient number, since it is larger than the sum of its proper divisors (6101816899).

208955053661 is an equidigital number, since it uses as much as digits as its factorization.

208955053661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42670155.

The product of its (nonzero) digits is 1944000, while the sum is 50.

The spelling of 208955053661 in words is "two hundred eight billion, nine hundred fifty-five million, fifty-three thousand, six hundred sixty-one".