668519404431 has 16 divisors (see below), whose sum is σ = 900617942784. Its totient is φ = 441050943744.

The previous prime is 668519404429. The next prime is 668519404463. The reversal of 668519404431 is 134404915866.

It is a happy number.

It is not a de Polignac number, because 668519404431 - 2¹ = 668519404429 is a prime.

It is a super-2 number, since 2×668519404431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668519404471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4016590 + ... + 4179716.

It is an arithmetic number, because the mean of its divisors is an integer number (56288621424).

Almost surely, 2^668519404431 is an apocalyptic number.

668519404431 is a deficient number, since it is larger than the sum of its proper divisors (232098538353).

668519404431 is a wasteful number, since it uses less digits than its factorization.

668519404431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177310.

The product of its (nonzero) digits is 2488320, while the sum is 51.

The spelling of 668519404431 in words is "six hundred sixty-eight billion, five hundred nineteen million, four hundred four thousand, four hundred thirty-one".