16651621715 has 8 divisors (see below), whose sum is σ = 20469310848. Its totient is φ = 12996387520.

The previous prime is 16651621687. The next prime is 16651621733. The reversal of 16651621715 is 51712615661.

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

It is not a de Polignac number, because 16651621715 - 2¹⁴ = 16651605331 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40613507 + ... + 40613916.

It is an arithmetic number, because the mean of its divisors is an integer number (2558663856).

Almost surely, 2^16651621715 is an apocalyptic number.

16651621715 is a deficient number, since it is larger than the sum of its proper divisors (3817689133).

16651621715 is an equidigital number, since it uses as much as digits as its factorization.

16651621715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81227469.

The product of its digits is 75600, while the sum is 41.

The spelling of 16651621715 in words is "sixteen billion, six hundred fifty-one million, six hundred twenty-one thousand, seven hundred fifteen".