245400206666 has 8 divisors (see below), whose sum is σ = 378048967140. Its totient is φ = 119383884288.

The previous prime is 245400206663. The next prime is 245400206699. The reversal of 245400206666 is 666602004542.

It can be written as a sum of positive squares in 2 ways, for example, as 238705530625 + 6694676041 = 488575^2 + 81821^2 .

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

It is a super-2 number, since 2×245400206666² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (245400206663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1658109431 + ... + 1658109578.

Almost surely, 2^245400206666 is an apocalyptic number.

245400206666 is a deficient number, since it is larger than the sum of its proper divisors (132648760474).

245400206666 is a wasteful number, since it uses less digits than its factorization.

245400206666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3316219048.

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 245400206666 in words is "two hundred forty-five billion, four hundred million, two hundred six thousand, six hundred sixty-six".