16405706397 has 16 divisors (see below), whose sum is σ = 21983696640. Its totient is φ = 10882502400.

The previous prime is 16405706341. The next prime is 16405706407. The reversal of 16405706397 is 79360750461.

It is a happy number.

It is not a de Polignac number, because 16405706397 - 2¹⁰ = 16405705373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16405706327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 938497 + ... + 955817.

It is an arithmetic number, because the mean of its divisors is an integer number (1373981040).

Almost surely, 2^16405706397 is an apocalyptic number.

It is an amenable number.

16405706397 is a deficient number, since it is larger than the sum of its proper divisors (5577990243).

16405706397 is a wasteful number, since it uses less digits than its factorization.

16405706397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18884.

The product of its (nonzero) digits is 952560, while the sum is 48.

The spelling of 16405706397 in words is "sixteen billion, four hundred five million, seven hundred six thousand, three hundred ninety-seven".