16620051428 has 96 divisors (see below), whose sum is σ = 32416378848. Its totient is φ = 7422771200.

The previous prime is 16620051419. The next prime is 16620051457. The reversal of 16620051428 is 82415002661.

It can be written as a sum of positive squares in 16 ways, for example, as 3632713984 + 12987337444 = 60272^2 + 113962^2 .

It is a super-2 number, since 2×16620051428² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20243258 + ... + 20244078.

It is an arithmetic number, because the mean of its divisors is an integer number (337670613).

Almost surely, 2^16620051428 is an apocalyptic number.

It is an amenable number.

16620051428 is a deficient number, since it is larger than the sum of its proper divisors (15796327420).

16620051428 is a wasteful number, since it uses less digits than its factorization.

16620051428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073 (or 1071 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 16620051428 in words is "sixteen billion, six hundred twenty million, fifty-one thousand, four hundred twenty-eight".