16553863949 has 8 divisors (see below), whose sum is σ = 18925790208. Its totient is φ = 14183709840.

The previous prime is 16553863913. The next prime is 16553863957. The reversal of 16553863949 is 94936835561.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 16553863949 - 2¹⁶ = 16553798413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16553863969) 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, 422957 + ... + 460434.

It is an arithmetic number, because the mean of its divisors is an integer number (2365723776).

Almost surely, 2^16553863949 is an apocalyptic number.

It is an amenable number.

16553863949 is a deficient number, since it is larger than the sum of its proper divisors (2371926259).

16553863949 is an equidigital number, since it uses as much as digits as its factorization.

16553863949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886075.

The product of its digits is 20995200, while the sum is 59.

The spelling of 16553863949 in words is "sixteen billion, five hundred fifty-three million, eight hundred sixty-three thousand, nine hundred forty-nine".