399679844653 has 2 divisors, whose sum is σ = 399679844654. Its totient is φ = 399679844652.

The previous prime is 399679844621. The next prime is 399679844689. The reversal of 399679844653 is 356448976993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 288322819849 + 111357024804 = 536957^2 + 333702^2 .

It is a cyclic number.

It is not a de Polignac number, because 399679844653 - 2⁵ = 399679844621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399679844153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199839922326 + 199839922327.

It is an arithmetic number, because the mean of its divisors is an integer number (199839922327).

Almost surely, 2^399679844653 is an apocalyptic number.

It is an amenable number.

399679844653 is a deficient number, since it is larger than the sum of its proper divisors (1).

399679844653 is an equidigital number, since it uses as much as digits as its factorization.

399679844653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058158080, while the sum is 73.

The spelling of 399679844653 in words is "three hundred ninety-nine billion, six hundred seventy-nine million, eight hundred forty-four thousand, six hundred fifty-three".