16779199837946 has 48 divisors (see below), whose sum is σ = 31534065861480. Its totient is φ = 6637099714560.

The previous prime is 16779199837913. The next prime is 16779199838021. The reversal of 16779199837946 is 64973899197761.

It can be written as a sum of positive squares in 4 ways, for example, as 14096683248025 + 2682516589921 = 3754555^2 + 1637839^2 .

It is a super-2 number, since 2×16779199837946² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9480290 + ... + 11110098.

Almost surely, 2^{16779199837946} is an apocalyptic number.

16779199837946 is a deficient number, since it is larger than the sum of its proper divisors (14754866023534).

16779199837946 is a wasteful number, since it uses less digits than its factorization.

16779199837946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637919 (or 1637912 counting only the distinct ones).

The product of its digits is 7777461888, while the sum is 86.

The spelling of 16779199837946 in words is "sixteen trillion, seven hundred seventy-nine billion, one hundred ninety-nine million, eight hundred thirty-seven thousand, nine hundred forty-six".