16720370385 has 8 divisors (see below), whose sum is σ = 26752592640. Its totient is φ = 8917530864.

The previous prime is 16720370369. The next prime is 16720370477. The reversal of 16720370385 is 58307302761.

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

It is not a de Polignac number, because 16720370385 - 2⁴ = 16720370369 is a prime.

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, 557345665 + ... + 557345694.

It is an arithmetic number, because the mean of its divisors is an integer number (3344074080).

Almost surely, 2^16720370385 is an apocalyptic number.

16720370385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16720370385 is a deficient number, since it is larger than the sum of its proper divisors (10032222255).

16720370385 is a wasteful number, since it uses less digits than its factorization.

16720370385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114691367.

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 16720370385 in words is "sixteen billion, seven hundred twenty million, three hundred seventy thousand, three hundred eighty-five".