16553786474 has 16 divisors (see below), whose sum is σ = 24942407976. Its totient is φ = 8239704000.

The previous prime is 16553786443. The next prime is 16553786477. The reversal of 16553786474 is 47468735561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15526904449 + 1026882025 = 124607^2 + 32045^2 .

It is not an unprimeable number, because it can be changed into a prime (16553786477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641624 + ... + 666924.

Almost surely, 2^16553786474 is an apocalyptic number.

16553786474 is a deficient number, since it is larger than the sum of its proper divisors (8388621502).

16553786474 is a wasteful number, since it uses less digits than its factorization.

16553786474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26761.

The product of its digits is 16934400, while the sum is 56.

The spelling of 16553786474 in words is "sixteen billion, five hundred fifty-three million, seven hundred eighty-six thousand, four hundred seventy-four".