209945169550 has 48 divisors (see below), whose sum is σ = 407537710560. Its totient is φ = 80314720640.

The previous prime is 209945169523. The next prime is 209945169587. The reversal of 209945169550 is 55961549902.

It is a junction number, because it is equal to n+sod(n) for n = 209945169491 and 209945169500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12721104 + ... + 12737596.

It is an arithmetic number, because the mean of its divisors is an integer number (8490368970).

Almost surely, 2^209945169550 is an apocalyptic number.

209945169550 is a deficient number, since it is larger than the sum of its proper divisors (197592541010).

209945169550 is a wasteful number, since it uses less digits than its factorization.

209945169550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27597 (or 27592 counting only the distinct ones).

The product of its (nonzero) digits is 4374000, while the sum is 55.

The spelling of 209945169550 in words is "two hundred nine billion, nine hundred forty-five million, one hundred sixty-nine thousand, five hundred fifty".