16553042401 has 4 divisors (see below), whose sum is σ = 18917762752. Its totient is φ = 14188322052.

The previous prime is 16553042371. The next prime is 16553042423. The reversal of 16553042401 is 10424035561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16553042401 - 2¹³ = 16553034209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16553042101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1182360165 + ... + 1182360178.

It is an arithmetic number, because the mean of its divisors is an integer number (4729440688).

Almost surely, 2^16553042401 is an apocalyptic number.

It is an amenable number.

16553042401 is a deficient number, since it is larger than the sum of its proper divisors (2364720351).

16553042401 is an equidigital number, since it uses as much as digits as its factorization.

16553042401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364720350.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 16553042401 its reverse (10424035561), we get a palindrome (26977077962).

The spelling of 16553042401 in words is "sixteen billion, five hundred fifty-three million, forty-two thousand, four hundred one".