16800977042 has 4 divisors (see below), whose sum is σ = 25201465566. Its totient is φ = 8400488520.

The previous prime is 16800977041. The next prime is 16800977111. The reversal of 16800977042 is 24077900861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13156319401 + 3644657641 = 114701^2 + 60371^2 .

It is a super-2 number, since 2×16800977042² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16800976984 and 16800977002.

It is not an unprimeable number, because it can be changed into a prime (16800977041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4200244259 + ... + 4200244262.

Almost surely, 2^16800977042 is an apocalyptic number.

16800977042 is a deficient number, since it is larger than the sum of its proper divisors (8400488524).

16800977042 is an equidigital number, since it uses as much as digits as its factorization.

16800977042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8400488523.

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 16800977042 in words is "sixteen billion, eight hundred million, nine hundred seventy-seven thousand, forty-two".