399548091664 has 20 divisors (see below), whose sum is σ = 795046710604. Its totient is φ = 194374747008.

The previous prime is 399548091643. The next prime is 399548091671. The reversal of 399548091664 is 466190845993.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 380639641600 + 18908450064 = 616960^2 + 137508^2 .

It is a super-3 number, since 3×399548091664³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 399548091596 and 399548091605.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337455567 + ... + 337456750.

Almost surely, 2^399548091664 is an apocalyptic number.

It is an amenable number.

399548091664 is a deficient number, since it is larger than the sum of its proper divisors (395498618940).

399548091664 is a wasteful number, since it uses less digits than its factorization.

399548091664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674912362 (or 674912356 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 64.

The spelling of 399548091664 in words is "three hundred ninety-nine billion, five hundred forty-eight million, ninety-one thousand, six hundred sixty-four".