16145550561 has 32 divisors (see below), whose sum is σ = 25921935360. Its totient is φ = 8732244096.

The previous prime is 16145550527. The next prime is 16145550563. The reversal of 16145550561 is 16505554161.

It is not a de Polignac number, because 16145550561 - 2⁹ = 16145550049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16145550563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 419260 + ... + 456146.

It is an arithmetic number, because the mean of its divisors is an integer number (810060480).

Almost surely, 2^16145550561 is an apocalyptic number.

It is an amenable number.

16145550561 is a deficient number, since it is larger than the sum of its proper divisors (9776384799).

16145550561 is a wasteful number, since it uses less digits than its factorization.

16145550561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38013.

The product of its (nonzero) digits is 90000, while the sum is 39.

The spelling of 16145550561 in words is "sixteen billion, one hundred forty-five million, five hundred fifty thousand, five hundred sixty-one".