404452641640 has 16 divisors (see below), whose sum is σ = 910018443780. Its totient is φ = 161781056640.

The previous prime is 404452641629. The next prime is 404452641661. The reversal of 404452641640 is 46146254404.

It can be written as a sum of positive squares in 2 ways, for example, as 326815735684 + 77636905956 = 571678^2 + 278634^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 10111316041 = 404452641640 / (4 + 0 + 4 + 4 + 5 + 2 + 6 + 4 + 1 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 404452641593 and 404452641602.

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, 5055657981 + ... + 5055658060.

Almost surely, 2^404452641640 is an apocalyptic number.

404452641640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404452641640 is an abundant number, since it is smaller than the sum of its proper divisors (505565802140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

404452641640 is a wasteful number, since it uses less digits than its factorization.

404452641640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10111316052 (or 10111316048 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 40.

The spelling of 404452641640 in words is "four hundred four billion, four hundred fifty-two million, six hundred forty-one thousand, six hundred forty".