16638817445 has 16 divisors (see below), whose sum is σ = 20533176000. Its totient is φ = 12938395008.

The previous prime is 16638817421. The next prime is 16638817493. The reversal of 16638817445 is 54471883661.

It is a cyclic number.

It is not a de Polignac number, because 16638817445 - 2⁶ = 16638817381 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290615 + ... + 343124.

It is an arithmetic number, because the mean of its divisors is an integer number (1283323500).

Almost surely, 2^16638817445 is an apocalyptic number.

It is an amenable number.

16638817445 is a deficient number, since it is larger than the sum of its proper divisors (3894358555).

16638817445 is an equidigital number, since it uses as much as digits as its factorization.

16638817445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633892.

The product of its digits is 3870720, while the sum is 53.

The spelling of 16638817445 in words is "sixteen billion, six hundred thirty-eight million, eight hundred seventeen thousand, four hundred forty-five".