209023078946450 has 48 divisors (see below), whose sum is σ = 389194208224200. Its totient is φ = 83520802176000.

The previous prime is 209023078946449. The next prime is 209023078946459. The reversal of 209023078946450 is 54649870320902.

It can be written as a sum of positive squares in 12 ways, for example, as 25400985123721 + 183622093822729 = 5039939^2 + 13550723^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 209023078946450.

It is not an unprimeable number, because it can be changed into a prime (209023078946459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 469216820 + ... + 469662080.

Almost surely, 2^{209023078946450} is an apocalyptic number.

209023078946450 is a deficient number, since it is larger than the sum of its proper divisors (180171129277750).

209023078946450 is a wasteful number, since it uses less digits than its factorization.

209023078946450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455183 (or 455178 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 59.

The spelling of 209023078946450 in words is "two hundred nine trillion, twenty-three billion, seventy-eight million, nine hundred forty-six thousand, four hundred fifty".