16551775378 has 8 divisors (see below), whose sum is σ = 25628555520. Its totient is φ = 8008923540.

The previous prime is 16551775369. The next prime is 16551775379. The reversal of 16551775378 is 87357715561.

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

It is a super-2 number, since 2×16551775378² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16551775379) 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, 133481998 + ... + 133482121.

It is an arithmetic number, because the mean of its divisors is an integer number (3203569440).

Almost surely, 2^16551775378 is an apocalyptic number.

16551775378 is a deficient number, since it is larger than the sum of its proper divisors (9076780142).

16551775378 is a wasteful number, since it uses less digits than its factorization.

16551775378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266964152.

The product of its digits is 6174000, while the sum is 55.

The spelling of 16551775378 in words is "sixteen billion, five hundred fifty-one million, seven hundred seventy-five thousand, three hundred seventy-eight".