16621693069 has 4 divisors (see below), whose sum is σ = 17496519040. Its totient is φ = 15746867100.

The previous prime is 16621693019. The next prime is 16621693079. The reversal of 16621693069 is 96039612661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16621693069 is a prime.

It is a super-2 number, since 2×16621693069² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16621693009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437412957 + ... + 437412994.

It is an arithmetic number, because the mean of its divisors is an integer number (4374129760).

Almost surely, 2^16621693069 is an apocalyptic number.

16621693069 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16621693069 is a deficient number, since it is larger than the sum of its proper divisors (874825971).

16621693069 is an equidigital number, since it uses as much as digits as its factorization.

16621693069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874825970.

The product of its (nonzero) digits is 629856, while the sum is 49.

The spelling of 16621693069 in words is "sixteen billion, six hundred twenty-one million, six hundred ninety-three thousand, sixty-nine".