206623237545 has 12 divisors (see below), whose sum is σ = 358146945156. Its totient is φ = 110199060000.

The previous prime is 206623237523. The next prime is 206623237549. The reversal of 206623237545 is 545732326602.

206623237545 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 232 + 375 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 162205146009 + 44418091536 = 402747^2 + 210756^2 .

It is not a de Polignac number, because 206623237545 - 2⁶ = 206623237481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 4591627501 = 206623237545 / (2 + 0 + 6 + 6 + 2 + 3 + 2 + 3 + 7 + 5 + 4 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 206623237545.

It is not an unprimeable number, because it can be changed into a prime (206623237549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2295813706 + ... + 2295813795.

It is an arithmetic number, because the mean of its divisors is an integer number (29845578763).

Almost surely, 2^206623237545 is an apocalyptic number.

It is an amenable number.

206623237545 is a deficient number, since it is larger than the sum of its proper divisors (151523707611).

206623237545 is a wasteful number, since it uses less digits than its factorization.

206623237545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4591627512 (or 4591627509 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 45.

The spelling of 206623237545 in words is "two hundred six billion, six hundred twenty-three million, two hundred thirty-seven thousand, five hundred forty-five".