16431559459396 has 27 divisors (see below), whose sum is σ = 28985247240159. Its totient is φ = 8150577798888.

The previous prime is 16431559459321. The next prime is 16431559459409. The reversal of 16431559459396 is 69395495513461.

The square root of 16431559459396 is 4053586.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×16431559459396² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1029602865 + ... + 1029618823.

Almost surely, 2^{16431559459396} is an apocalyptic number.

16431559459396 is the 4053586-th square number.

It is an amenable number.

16431559459396 is a deficient number, since it is larger than the sum of its proper divisors (12553687780763).

16431559459396 is an frugal number, since it uses more digits than its factorization.

16431559459396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32176 (or 16088 counting only the distinct ones).

The product of its digits is 472392000, while the sum is 70.

The spelling of 16431559459396 in words is "sixteen trillion, four hundred thirty-one billion, five hundred fifty-nine million, four hundred fifty-nine thousand, three hundred ninety-six".