399548712961 has 4 divisors (see below), whose sum is σ = 406098691924. Its totient is φ = 392998734000.

The previous prime is 399548712949. The next prime is 399548713013. The reversal of 399548712961 is 169217845993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63073308736 + 336475404225 = 251144^2 + 580065^2 .

It is a cyclic number.

It is not a de Polignac number, because 399548712961 - 2⁹ = 399548712449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399548712893 and 399548712902.

It is not an unprimeable number, because it can be changed into a prime (399548782961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3274989390 + ... + 3274989511.

It is an arithmetic number, because the mean of its divisors is an integer number (101524672981).

Almost surely, 2^399548712961 is an apocalyptic number.

It is an amenable number.

399548712961 is a deficient number, since it is larger than the sum of its proper divisors (6549978963).

399548712961 is an equidigital number, since it uses as much as digits as its factorization.

399548712961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6549978962.

The product of its digits is 29393280, while the sum is 64.

The spelling of 399548712961 in words is "three hundred ninety-nine billion, five hundred forty-eight million, seven hundred twelve thousand, nine hundred sixty-one".