208012685445 has 90 divisors (see below), whose sum is σ = 377934675954. Its totient is φ = 109456850880.

The previous prime is 208012685381. The next prime is 208012685473. The reversal of 208012685445 is 544586210802.

208012685445 is a `hidden beast` number, since 2 + 0 + 8 + 0 + 126 + 85 + 445 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 107427928644 + 100584756801 = 327762^2 + 317151^2 .

It is not a de Polignac number, because 208012685445 - 2⁶ = 208012685381 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 208012685445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 1202385379 + ... + 1202385551.

Almost surely, 2^208012685445 is an apocalyptic number.

It is an amenable number.

208012685445 is a deficient number, since it is larger than the sum of its proper divisors (169921990509).

208012685445 is an frugal number, since it uses more digits than its factorization.

208012685445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

Multiplying 208012685445 by its sum of digits (45), we get a square (9360570845025 = 3059505²).

208012685445 divided by its sum of digits (45) gives a square (4622504121 = 67989²).

The spelling of 208012685445 in words is "two hundred eight billion, twelve million, six hundred eighty-five thousand, four hundred forty-five".