16777506778 has 8 divisors (see below), whose sum is σ = 25185519072. Its totient is φ = 8382333756.

The previous prime is 16777506731. The next prime is 16777506817. The reversal of 16777506778 is 87760577761.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3206550 + ... + 3211777.

It is an arithmetic number, because the mean of its divisors is an integer number (3148189884).

Almost surely, 2^16777506778 is an apocalyptic number.

16777506778 is a deficient number, since it is larger than the sum of its proper divisors (8408012294).

16777506778 is a wasteful number, since it uses less digits than its factorization.

16777506778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6419636.

The product of its (nonzero) digits is 24202080, while the sum is 61.

The spelling of 16777506778 in words is "sixteen billion, seven hundred seventy-seven million, five hundred six thousand, seven hundred seventy-eight".