16664332641 has 64 divisors (see below), whose sum is σ = 26098329600. Its totient is φ = 9351244800.

The previous prime is 16664332621. The next prime is 16664332649. The reversal of 16664332641 is 14623346661.

It is not a de Polignac number, because 16664332641 - 2³⁰ = 15590590817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16664332593 and 16664332602.

It is not an unprimeable number, because it can be changed into a prime (16664332649) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6385945 + ... + 6388553.

It is an arithmetic number, because the mean of its divisors is an integer number (407786400).

Almost surely, 2^16664332641 is an apocalyptic number.

16664332641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16664332641 is a deficient number, since it is larger than the sum of its proper divisors (9433996959).

16664332641 is a wasteful number, since it uses less digits than its factorization.

16664332641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2870.

The product of its digits is 373248, while the sum is 42.

The spelling of 16664332641 in words is "sixteen billion, six hundred sixty-four million, three hundred thirty-two thousand, six hundred forty-one".