403320551661 has 12 divisors (see below), whose sum is σ = 616843196892. Its totient is φ = 253063875456.

The previous prime is 403320551629. The next prime is 403320551677. The reversal of 403320551661 is 166155023304.

403320551661 is a `hidden beast` number, since 40 + 3 + 3 + 2 + 0 + 551 + 6 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 263470730436 + 139849821225 = 513294^2 + 373965^2 .

It is not a de Polignac number, because 403320551661 - 2⁵ = 403320551629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403320551561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1318040866 + ... + 1318041171.

It is an arithmetic number, because the mean of its divisors is an integer number (51403599741).

Almost surely, 2^403320551661 is an apocalyptic number.

It is an amenable number.

403320551661 is a deficient number, since it is larger than the sum of its proper divisors (213522645231).

403320551661 is a wasteful number, since it uses less digits than its factorization.

403320551661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636082060 (or 2636082057 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 403320551661 its reverse (166155023304), we get a palindrome (569475574965).

The spelling of 403320551661 in words is "four hundred three billion, three hundred twenty million, five hundred fifty-one thousand, six hundred sixty-one".