16464396991 has 8 divisors (see below), whose sum is σ = 18818953760. Its totient is φ = 14110465248.

The previous prime is 16464396973. The next prime is 16464397051. The reversal of 16464396991 is 19969346461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16464396991 - 2²¹ = 16462299839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16464396911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98376 + ... + 206413.

It is an arithmetic number, because the mean of its divisors is an integer number (2352369220).

Almost surely, 2^16464396991 is an apocalyptic number.

16464396991 is a deficient number, since it is larger than the sum of its proper divisors (2354556769).

16464396991 is an equidigital number, since it uses as much as digits as its factorization.

16464396991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312513.

The product of its digits is 7558272, while the sum is 58.

The spelling of 16464396991 in words is "sixteen billion, four hundred sixty-four million, three hundred ninety-six thousand, nine hundred ninety-one".