398660745650 has 24 divisors (see below), whose sum is σ = 746921474100. Its totient is φ = 158300322560.

The previous prime is 398660745647. The next prime is 398660745667. The reversal of 398660745650 is 56547066893.

It can be written as a sum of positive squares in 6 ways, for example, as 88412859649 + 310247886001 = 297343^2 + 556999^2 .

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 398660745650.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29092475 + ... + 29106174.

Almost surely, 2^398660745650 is an apocalyptic number.

398660745650 is a deficient number, since it is larger than the sum of its proper divisors (348260728450).

398660745650 is a wasteful number, since it uses less digits than its factorization.

398660745650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58198798 (or 58198793 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 59.

The spelling of 398660745650 in words is "three hundred ninety-eight billion, six hundred sixty million, seven hundred forty-five thousand, six hundred fifty".