16720405177 has 8 divisors (see below), whose sum is σ = 19115404992. Its totient is φ = 14326998000.

The previous prime is 16720405157. The next prime is 16720405189. The reversal of 16720405177 is 77150402761.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-16720405177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16720405157) 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, 375574 + ... + 417727.

It is an arithmetic number, because the mean of its divisors is an integer number (2389425624).

Almost surely, 2^16720405177 is an apocalyptic number.

It is an amenable number.

16720405177 is a deficient number, since it is larger than the sum of its proper divisors (2394999815).

16720405177 is an equidigital number, since it uses as much as digits as its factorization.

16720405177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796319.

The product of its (nonzero) digits is 82320, while the sum is 40.

The spelling of 16720405177 in words is "sixteen billion, seven hundred twenty million, four hundred five thousand, one hundred seventy-seven".