160720809999 has 16 divisors (see below), whose sum is σ = 216557638752. Its totient is φ = 106016145408.

The previous prime is 160720809971. The next prime is 160720810009. The reversal of 160720809999 is 999908027061.

It is a happy number.

It is a Cunningham number, because it is equal to 400900²-1.

It is not a de Polignac number, because 160720809999 - 2¹⁹ = 160720285711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (160720829999) 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, 1135887 + ... + 1269519.

It is an arithmetic number, because the mean of its divisors is an integer number (13534852422).

Almost surely, 2^160720809999 is an apocalyptic number.

160720809999 is a deficient number, since it is larger than the sum of its proper divisors (55836828753).

160720809999 is a wasteful number, since it uses less digits than its factorization.

160720809999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137866.

The product of its (nonzero) digits is 4408992, while the sum is 60.

The spelling of 160720809999 in words is "one hundred sixty billion, seven hundred twenty million, eight hundred nine thousand, nine hundred ninety-nine".