16421677778 has 8 divisors (see below), whose sum is σ = 26871836400. Its totient is φ = 7464398980.

The previous prime is 16421677777. The next prime is 16421677841. The reversal of 16421677778 is 87777612461.

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

It is not an unprimeable number, because it can be changed into a prime (16421677777) 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, 373219928 + ... + 373219971.

It is an arithmetic number, because the mean of its divisors is an integer number (3358979550).

Almost surely, 2^16421677778 is an apocalyptic number.

16421677778 is a deficient number, since it is larger than the sum of its proper divisors (10450158622).

16421677778 is a wasteful number, since it uses less digits than its factorization.

16421677778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746439912.

The product of its digits is 5531904, while the sum is 56.

The spelling of 16421677778 in words is "sixteen billion, four hundred twenty-one million, six hundred seventy-seven thousand, seven hundred seventy-eight".